UNION METALLIC CARTRIDGE CO. V. UNITED STATES CARTRIDGE CO., 112 U. S. 624 (1884)Subscribe to Cases that cite 112 U. S. 624
U.S. Supreme Court
Union Metallic Cartridge Co. v. United States Cartridge Co., 112 U.S. 624 (1884)
Union Metallic Cartridge Company v. United States Cartridge Company
Argued December 5, 8-9, 1834
Decided December 22, 1884
112 U.S. 624
Letters patent No. 27,094 were issued to Ethan Allen February 14, 1860, for 14 years, for an "improvement in machine for making percussion cartridge cases." The patent was reissued in two divisions, No. 1,948 and No. 1,949, May 9, 1865. No. 1,948 embraced that part of the invention which concerned the mechanism for striking up the hollow rim at one stroke. The original patent and drawings showed such mechanism to be a moving die and a fixed bunter. In No. 1,948, the description was altered so as to state that the bunter might be carried against the die, and its two claims each contained the words "substantially as described." An extension of No. 1,948 having been applied for, it was opposed, on the ground that such arrangement of a fixed die and a moving bunter was a new invention, interpolated into the reissue. The Commissioner of Patents so held, and required such new matter to be disclaimed, as a condition precedent to the extension. A disclaimer was filed disclaiming the movable bunter as of the invention of Allen. No. 1,948 was then extended by a certificate which stated that a disclaimer had been filed to that part of the invention embraced in such new matter. In a suit in equity afterwards brought on No. 1,948, against machines having a fixed die and a moving bunter, for infringements committed both before and after the extension. Held that the effect of the disclaimer was to exclude those machines from the scope of any claim in No. 1,948, without reference to the question whether they contained mechanical equivalents for the moving die and the fixed bunter.
Allen had not, before the granting of the original patent, made any machine in which the die was fixed and the bunter movable, and it was never lawful to cover, by the claims of a reissue, an improvement made after the granting of the original patent.
Under § 54 of the Act of July 8, 1870, c. 230, 16 Stat. 205, a disclaimer could be made only by a patentee who had claimed more than that of which he was the original or first inventor or discoverer, and he could make a disclaimer only of such parts of the thing patented as he should not choose to claim or hold by virtue of the patent.
In so disclaiming or limiting a claim, descriptive matter on which the disclaimed claim was based might be erased, but if there was merely a defective chanrobles.com-redchanrobles.com-red
or insufficient description, the only mode of correcting it was by a reissue.
The decision in Leggett v. Avery, 101 U. S. 256, cited and applied.
An acquiescence and disclaimer, on a decision requiring the disclaimer as a condition precedent to an extension, are as operative to prevent the afterwards insisting on a recovery on the invention disclaimed, as to prevent a subsequent reissue to claim what was so disclaimed.
Letters patent of the United States, No. 27,094, were issued to Ethan Allen February 14, 1860, for 14 years, for an "improvement in machine for making percussion cartridge cases." A reissue of this patent was granted, in two divisions, No. 1,948 and No. 1,949, May 9, 1865, the application for the reissue having been filed April 7, 1865. The specification of No. 27,094 set forth two improvements: (1) an arrangement or mechanism to trim the open end of the case of the cap-cartridge, to make the articles all alike and true; (2) striking up or forming the swelled end to form the recess for the priming, as shown at Z, from that of Y at one stroke, in distinction from spinning them. There were two claims in No. 27,094: (1) the trimming mechanism; (2) striking or forming the hollow rim at one stroke or operation. In reissuing the patent, the trimming mechanism was made the subject of No. 1,949, and the other improvement (the subject matter of claim 2 of No. 27,094), was made the subject of No. 1,948. This suit is brought for the infringement of No. 1,948 alone. So much of the specification and claims of No. 27,094 as relates to the subject of No. 1,948, is copied below on the left hand, and the specification and claims of No. 1,948 are copied below on the right hand, the parts of each not found in the other being in italic:
"Original. No. 27,094"
"Be it known that I, Ethan Allen of the City and County of Worcester, State of Massachusetts, have invented certain new and useful improvements in machinery for making loaded caps or cap-cartridges, and I hereby declare the following to be a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, in which Fig. 1 is a top view or plan, and Fig. 2 a side view; the same letters indicating the same parts in both."
"My improvements relate to the construction or formation of the case of the cap cartridge in the form shown at Z, or nearly so, and consist . . . in striking up or forming the swelled end to form the recess for the priming, as shown at Z, from that of Y at one stroke, in distinction from spinning them, as has heretofore been done."
"The construction of my improvements, as shown in the drawings, is as follows: J is the driving pulley to receive motion, and its shaft is provided with cranks or eccentrics at each end, to which the rods H and H', connect, the shaft turning in suitable bearings in the frame or base K. . . . F is a slide receiving motion by H', and moving in the ways G G, carrying the mandrel B, which passes through the movable die, D, which has a spring to keep or move it back toward F, and an enlargement in its center, to facilitate placing the case A', to be taken by B. The end of D, next to E, has a hole fitting on the outside of the case A. E is a die with an adjusting screw. Y is a case as it comes from the press, and Z shows the same after being trimmed and set, or, in other words, gone through the following operation, to-wit: . . ."
"It [the case or shell] is placed in D or A' to be taken on B and carried forward until its end projects (sufficiently to form its rim) out of D, when F, meeting D, carries it with A in that position up against E, which flattens the end, and forms the hollow rim, as shown in section at Z, Fig. 2, and the motion of J continuing, the parts all return to their respective places, ready for another, which, during the same time, has been prepared, as before described; the finished case dropping between the dies, D and E, @or, if sticking in D, is punched out by the first motion of the next one and falls out of its way."
"Having thus fully described my invention, what I claim therein as new and desire to secure by letters patent is . . ."
"Second. I claim striking or forming the hollow rim at one stroke or operation, as above set forth and [email protected]"
"Reissue. No. 1,948"
"Be it known that I, Ethan Allen of the City and County of Worcester, and State of Massachusetts, have invented certain new and useful improvements in machinery for making loaded caps or cap-cartridges, and I hereby declare the following to be a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, in which Figure 1 is a top view or plan, and Fig. 2 is a side view, and pertains to a machine which is the subject of another reissue of these letters patent."
"My improvements relate to the construction or formation of the case of a metallic cartridge, and consist in an arrangement of mechanism for forming or striking up the swelled end to form the recess for the priming, as shown at Z, from that of Y at one stroke or operation, in distinction from spinning them, as has heretofore been done."
"The construction of my improvements, as shown in the drawings, is as follows: K is the base of the machine; J, the driving pulley, which is provided with a crank or eccentric, to which the rod H', is connected; F is a slide receiving motion by H', and moving in ways G G, carrying the mandrel B, which passes through the die D; the die D has a spring to keep or move it back toward F and a hopper-like opening in the upper side to facilitate placing the case A, to be taken by B and carried into the die D. The mandrel B has a shoulder, a sufficient distance from the end to allow it to enter the cartridge shell just the right distance, and leave enough metal to be pulled into the head of the cartridge. The die D is just the right size to be filled by the shell A when pressed into it by the punch or mandrel B. E is a die with an adjustable screw, and the case may be carried against it to form the head or rim, or that may be carried against the die D by similar mechanism to F and H'; Z is a case or shell after being headed, forming the cavity for the fulminating powder."
"The operation is as follows, viz., motion, being given to pulley J, is communicated through H' to F and B, and the cases or shells are placed in the recess or in an inclined tube, which feeds them to the punch B. The shell is taken on the punch B, and carried through the die D until the end projects sufficiently to form its rim, when F, meeting D, carries it with A in that position up against E, which flattens the end and forms the hollow rim, as shown in section at Z, Fig. 2, and, the motion of J continuing, the parts all return to their respective places, ready for another shell, which, during the same time, has been placed in position, as before described, and the punch B, taking on another shell, is carried into the die D, and presses out the one before headed, which drops between the dies D and E, when the operation is repeated as before."
"@I claim the mandrel which carries the cartridge shell, in combination with the die D, which admits the same, and against which the closed end of the cartridge shell is headed, substantially as described."
"Second. I claim the die D, constructed and operating for the heading of cartridge shells, substantially as [email protected]"
The following are the drawings of the original and of the reissue: chanrobles.com-redchanrobles.com-red
The Allen machine, as organized for heading, and making a flange upon, cartridge shells, consists mainly of a mandrel, a die, and a bunter, which are combined together in order to operate. The mandrel is a rod with a shoulder upon it, the rod beyond the shoulder being of such diameter as to enter the cartridge shell which is to be headed with a pretty close fit, and the shoulder being at right angles to the rod, and formed to support the edge of the shell at the open end of the cartridge during the operation of heading. The die is a block of metal with a hole in it, of just the size of the outside of the shell, and the axes of the die and mandrel are in the same line. The bunter is a piece of metal so located that it is opposite one end of the die. The machine is also provided with a gutter, which is a prolongation of the hole in the die, but open on top, into which shells are to be introduced prior to being acted upon by the machine. When an unheaded shell is placed in this gutter, with the mandrel as far retracted from the die as possible, the mandrel advances, inserts chanrobles.com-redchanrobles.com-red
itself into the shell, and shoves the shell into the die with its closed end projecting beyond the die a sufficient distance to afford metal from which the flange may be formed. In this position the outside of the shell is supported by the die, the inside of the shell by the mandrel, and the edges at the open end of the shell by the shoulder on the mandrel. The die, mandrel, and shell then advance together, and the closed end of the shell is forced against the bunter, the shell being thus squeezed down so as to form the flange of the cartridge. The mandrel then retreats, and, as it retreats, slips out of the shell, leaving the headed shell in the die, and, when the mandrel is fully out of the shell, the die is in its old position. The shell cannot follow the mandrel, owing to the fact that it is now headed, and that its head is on that side of the die which is furthest from the mandrel. After the mandrel has retreated sufficiently far from that end of the die which is nearest the mandrel, a second unflanged shell may be placed in the gutter. The mandrel then advances and enters the shell as before, and the advance of this shell on the end of the mandrel drives out the shell which has just been headed, and was sticking in the die. After this second shell has been driven far enough into the die, it is headed as the first shell was, and is, in turn, pushed out by a third shell, and so on in succession. In the operation of the machine, the shell is forced into one end of the die, and expelled at the other end, so that the shell moves in the same line, and in the same direction, from the time it is first acted upon by the mandrel until it is completely expelled from the die. The end of the die furthest from the mandrel is the anvil or rest against which the shell is headed by the conjoint action of the die and the bunter, the flange being formed fully at the time when the die and bunter are as near as possible the one to the other.
The description in the original patent of the mechanism for striking up or forming at one stroke the swelled end to form the recess for the priming, describes the die D as movable, and as being carried with the case or shell, and the mandrel B in it, against the stationary die E. This is the description to chanrobles.com-redchanrobles.com-red
which the second claim of the original patent refers when it claims "striking or forming the hollow rim at one stroke or operation, as above set forth and described." The drawings represent that arrangement, and no other.
In the reissue, it is stated that the case or shell may be carried against the die E to form the rim, or the die E may be carried against the die D by similar mechanism, to the slide F and the rod H'. It is also stated that the cases or shells are placed in the recess, or gutter, or in an inclined tube, which feeds them to the punch or mandrel B. Nothing was said in the specification of the original patent about carrying the die E against the die D, or about feeding the cases or shells by an inclined tube.
Allen having died, Sarah E. Allen was duly appointed his executrix, in February, 1871. In November, 1873, she applied to the Commissioner of Patents for an extension of No. 1,948 and of No. 1,949. The application was opposed by E. Remington & Sons. Much testimony was taken on both sides. The day of hearing was February 4, 1874. The Commissioner of Patents decided to grant the extension and rendered the following decision, (5 Off.Gaz. 147):
"This is an application by the executrix of the estate of Ethan Allen for the extension of reissued patents Nos. 1,948 and 1,949, granted May 9, 1865. The original patent was granted to Ethan Allen February 14, 1860, and comprehended a combined apparatus for trimming the open ends, and then heading the closed ends, of blanks for forming metallic cartridge shells. These operations are each performed automatically but independently, by different portions of the machinery. Reissue No. 1,948 comprehends the mechanism for heading the shell, and No. 1,949 that for trimming it. No testimony is presented relating to the latter, and it may be dismissed from consideration. Some interpolations of new matter appear in the former, but they have been disclaimed, rendering the scope of the patent unequivocally that of the invention originally described and illustrated in drawing and model. The device in question consists of a hollow recessed sliding die, a reciprocating mandrel, having a shoulder permitting it to enter a shell
the proper distance for heading, and a stationary bunter, organized into a machine which operates as follows: the mandrel being withdrawn into the back portion of the die, which serves merely as a guide for it, a shell with its open end to the rear is placed in the recess of the die, in the path of the mandrel. As the mandrel advances, it enters the shell, and carries it into the die until its closed end projects a little in front for heading. At this point, the stock of the mandrel strikes the rear of the die and carries it forward until the projecting end of the shell strikes a fixed anvil and is headed. The mandrel and die then retreat, carrying the headed shell, the die being forced back by a spring to its original position, and the mandrel continuing until it has withdrawn from the shell and passed the feeding recess. The headed shell remains in the die until it is forced out by the advance of the next shell. This is the machine patented, and the claims of the patent are as follows:"
" 1. The mandrel which carries the cartridge shell, in combination with the die D, which admits the same, and against which the closed end of the cartridge shell is headed, substantially as described."
" 2. The die D, constructed and operating for the heading of cartridge shells, substantially as described."
"This was the first successful organized automatic machine for heading cartridge shells. It has undergone various improvements, however, and, as built and (according to the testimony of the witness Cook) used by the inventor, it is not now in use. It, however, furnished the essential principle of construction which has been maintained in all succeeding heading machines of its class. The hollow die and reciprocating mandrel to receive and carry forward the shell to be headed, and at the same time force out the preceding headed shell, are the chief elements of the machines which have produced the vast quantity of shells that have come into the market since the date of this invention. The rear or guide portion of the die is omitted in the present machines; and, instead of a recess in the die, a special feeding device is employed; also, instead of advancing the die against the anvil, it is now made stationary, and the anvil is advanced, the die spring being transferred to it. Whether this latter modification, which is the
principal one, and is admitted to effect materially superior results in heading the larger sizes of shells, is in legal contemplation an equivalent construction mechanically improved, or a substantive invention, has been the subject of much contention in this application. I am, however, so entirely convinced that the matter introduced into the reissue, describing the holding die as stationary, and the bunter as movable, was new matter describing a substantially different invention from the original, possessing different functions, that I have required, as a condition precedent to extension, that this new matter, together with that of the inclined tube for feeding, should be absolutely disclaimed. With such disclaimer, the patent is extended."
With a view to the extension, the following disclaimer was filed on the fourth of February, 1874:
"To the Commissioner of Patents:"
"Whereas, reissued letters patent of the United States were, on the ninth day of May, A.D. 1865, granted to Ethan Allen of Worcester, in the County of Worcester, State of Massachusetts, numbered 1,948, and whereas, the Union Metallic Cartridge Company are now the sole owners of said reissued letters patent, and whereas, Sarah E. Allen of said Worcester, as the executrix of the goods and estate of said Ethan Allen is the sole owner of any extended term of said letters patent which may hereafter be granted, and whereas, the Union Metallic Cartridge Company aforesaid have an equitable interest in the extended term of said letters patent: Now therefore the said Union Metallic Cartridge Company and the said Sarah E. Allen executrix as aforesaid, respectfully show to the honorable Commissioner of Patents that through inadvertence, accident, or mistake, the words 'or that may be carried against the die, D, by similar mechanism to F and H',' were inserted in the descriptive part of said reissued letters patent No. 1,948, which words were not in the descriptive part of the original letters patent of said Ethan Allen and thereupon your petitioners disclaim the said movable die E, as being of the invention of said Ethan Allen except insofar as the same
by fair construction may be deemed the mechanical equivalent of the die E, described and shown in said original letters patent and the drawing thereof. And whereas the said reissued letters patent No. 1,948, in the descriptive part thereof, contain the words 'or in an inclined tube,' which words are not found in the descriptive part of the original letters patent of said Ethan Allen but said words were introduced into the specification of said reissued letters patent by inadvertence, accident, or mistake, your petitioners disclaim such inclined tube as being of the invention of the said Allen."
"SARAH E. ALLEN, Executrix"
"UNION METALLIC CARTRIDGE CO."
"M. HARTLEY, President"
The following additional disclaimer was filed on the 13th of February, 1874:
"To the Honorable the Commissioner of Patents:"
"Whereas reissued letters patent of the United States were, on the ninth day of May, A.D. 1865, granted to Ethan Allen of Worcester, in the County of Worcester and State of Massachusetts, numbered 1,948, and whereas, the Union Metallic Cartridge Company, of Bridgeport, State of Connecticut, are now the sole owners of said reissued letters patent, and whereas, Sarah E. Allen of said Worcester, as the executrix of the goods and estate of said Ethan Allen is the sole owner of any extended term of said letters patent which may be granted: Now therefore the Union Metallic Cartridge Company and Sarah E. Allen executrix, as aforesaid, respectfully show to the honorable Commissioner of Patents that, through inadvertence, accident, or mistake, the words 'or that may be carried against the die, D, by similar mechanism to F and H'' were inserted in the descriptive part of said reissued letters patent No. 1,948, which words were not in the descriptive part of the original letters patent of said Ethan Allen, and thereupon your petitioners disclaim the said movable die E (called a bunter), as being of the invention of said Ethan Allen thus leaving the description of said die E, the same as shown in the
original letters patent, and the drawings thereof. And whereas the said reissued letters patent numbered 1,948, in the descriptive part thereof, contain the words 'or in an inclined tube,' which words are not found in the descriptive part of the original letters patent of said Ethan Allen but said words were introduced into the specification of said reissued letters patent by inadvertence, accident, or mistake, your petitioners disclaim said inclined tube as being of the invention of said Ethan Allen. This disclaimer is absolute, and is filed as an additional disclaimer to that filed February 4, A.D. 1874, in which certain reservations were made."
"UNION METALLIC CARTRIDGE CO."
"M. HARTLEY, President"
"SARAH E. ALLEN, Executrix"
"New York, February 9, 1874"
The certificate of extension of No. 1,948 was as follows:
"Whereas, upon the petition of Sarah E. Allen of Worcester, Massachusetts, executrix of the estate of Ethan Allen deceased, for the extension of the patent granted to said Ethan Allen February 14, 1860, and reissued May 9, 1865, numbered 1,948, for 'machine for making cartridge cases,' the undersigned, in accordance with the Act of Congress, approved the eighth day of July, 1870, entitled 'An act to revise, consolidate, and amend the statutes relating to patents and copyrights' (the said Sarah E. Allen, executrix, having filed a 'disclaimer' to that part of the invention embraced in the following words: 'or that may be carried against the die, D, by similar mechanism to F and H';' also the words 'or in an inclined tube'), did, on this thirteenth day of February, 1874, decide that said patent ought to be extended: Now therefore I, Mortimer D. Leggett, Commissioner of Patents, by virtue of the power vested in me by said act of Congress, do renew and extend the said patent, and certify that the same is hereby extended for the term of seven years from and after the expiration of the first term, viz., from the fourteenth day of February, 1874; which certificate, being duly entered of record
in the Patent Office, the said patent has now the same effect in law as though the same had been originally granted for the term of twenty-one years."
"In testimony whereof, I have caused the seal of the Patent Office to be hereunto affixed this thirteenth day of February, 1874, and of the independence of the United States the ninety-eighth."
"[Seal] M.D. LEGGETT, Commissioner"
Sarah E. Allen executrix, having, on the 21st of February, 1874, assigned her title to the extended term of No. 1,948 to the Union Metallic Cartridge Company, it brought this suit in equity against the United States Cartridge Company on the 18th of March, 1874, for the infringement of No. 1,948. The bill alleged an assignment by the executrix to the plaintiff, of her title to No. 1,948, on the 10th of February, 1871; an assignment by the plaintiff to her, on the 7th of February, 1874, of all of its title to No. 1,948; the extension, and the assignment of the extended term. The assignments above mentioned have been duly proved. The bill makes no reference to any disclaimer.
The machine of the defendant has the die D, stationary, and the die E, or bunter, movable, and it has an inclined tube for feeding. The die D, the mandrel B, and the bunter E are, as tools, the same as those in the plaintiff's machine. The mandrel enters the shell, pushes it into the die D supports it on the inside while it is being headed, and the unheaded shell expels the headed shell from the die D, as in the plaintiff's machine. The die D supports the outside of the shell while it is being headed, and the end of that die acts as an anvil against which the flange is formed by the joint operation of such anvil and the bunter, as in the plaintiff's machine. The flange is fully formed at the time when the end of the die D and the bunter are as close together as the operation of the machine will permit them to be, which is true also of the plaintiff's machine. In the defendant's machine, as in the plaintiff's, the unheaded shell enters at one end of the die D, and is expelled from the other end, and moves always in chanrobles.com-redchanrobles.com-red
the same direction with relation to the die D from the time that the mandrel first takes charge of it until, after being headed, it is expelled from the die. But in the defendant's machine, the die D stands still and the bunter moves toward it to head the shell, while the drawings of No. 27,094 and No. 1,948 show a stationary bunter, and the die D, moving toward it, to head the shell.
The answer denies that the reissue was lawful and avers that the original patent was surrendered to claim inventions not made by Allen; that the reissue No. 1,948 is not for the same invention was the original patent; that as the reissue was void, the extension also was void; that the Commissioner granted the extension only on the express condition precedent, that certain new matter unlawfully introduced into the reissue (as decided by him) should be absolutely disclaimed, and that only upon such disclaimer should the patent be extended, and that said condition has not been complied with. It denied infringement.
Proofs having been taken, the case was heard before Judge Shepley, and he decided it in favor of the plaintiff, on the 13th of April, 1877, and entered a decree holding No. 1,948 to be valid, and to have been infringed, and awarded an account of profits and damages, before a master, from February 10, 1871, except as to the period from February 7, 1874, to February 21, 1874, and a perpetual injunction restraining the defendant from making, using, or vending "machines for heading cartridge shells, having a die, mandrel, and bunter," excepting five machines specially named, the question as to the use of which was reserved till the master should make his report. The decision of Judge Shepley, 2 Ban. & A. 593, and 11 Off.Gaz. 1113, says:
"In the machine admitted to be used by the defendant are found substantially the same die, mandrel, and bunter, operating in the same manner to form the flanged head of the cartridge and to expel the shell after being headed, except that in defendant's machine the bunter moves toward the die to head the shell, while in the Allen machine the die moves toward the bunter to head the shell. The fact, as proved, that, especially in the case of cartridges of larger sizes, there
is an advantage in having the die stationary, while the bunter moves toward it, is not sufficient alone to show that this latter form of the machine is not an equivalent of the other, all the elements of the combination existing alike in both, and acting alike in combination. It is contended on the part of the defendant that the action of the Commissioner of Patents in requiring a disclaimer of so much of the reissued patent as claimed in specific terms the use of the movable bunter and the stationary die, as an equivalent for the movable die and the fixed bunter, before granting an extension, is conclusive upon the complainant, but we do not so regard it. The patentee, without describing equivalents, is entitled to use equivalents, and to treat the use of equivalents by others as an infringement, and this, upon the evidence in the record, appears to be a clear case of such a use."
The master made a report as to profits, to which exceptions were filed by both parties. On the hearing of the exceptions, the case was reheard before Judge Lowell on the question as to whether the original decree should be reversed. He rendered a decision, 7 F.3d 4, in which he said:
"Allen's original patent described a machine organized to move a 'die' against a 'bunter,' and, by their contact, to form a flange or head upon the metallic cartridge, which was carried by the die. The defendant's machines brought a movable bunter against a fixed die. This was an improved form of the machine, and was perhaps a patentable improvement, but it was the same machine, and was an undoubted infringement. This improvement was invented by Allen himself, but, after he had obtained his patent, and when he asked for a reissue, he inserted in his description of the mechanism this modified and improved form. The Commissioner required him to disclaim this part of his description, as a condition precedent to granting the reissue. Judge Shepley held that the disclaimer did not prevent the patentee from enjoining the use of machines having this improvement. It is now argued, and, certainly, with much force, that Leggett v. Avery, 101 U. S. 256, holds the patentee to this disclaimer, as an estoppel. I appreciate the argument, but do not consider myself bound to reverse
Judge Shepley's decision, which I should not feel at liberty to do unless my mind were entirely satisfied that he was wrong. No one can doubt that if a patentee obtains a patent upon his solemn admission of certain facts, he shall never thereafter be permitted to controvert them. This is Leggett v. Avery. Judge Shepley, though giving his opinion before that case was decided, could not have overlooked this point. I understand him to decide that the admission in this case was not of a fact of invention, but of the propriety of inserting a certain clause in the descriptive part of the specification, and, if this were not so, still, if the patentee's invention and his patent rightly included this form, as an equivalent, it was a mere nullity, like an admission of law, to confess that it did not include it. This is the idea shortly expressed by Judge Shepley, and I do not see any necessary conflict between it and the decision of the supreme court."