U.S. Supreme Court
Railroad Company v. Mellon, 104 U.S. 112 (1881)
Railroad Company v. Mellon
104 U.S. 112
APPEAL FROM THE CIRCUIT COURT OF THE UNITED
STATES FOR THE EASTERN DISTRICT OF PENNSYLVANIA
1. The scope of letters patent must be limited to the invention covered by "the claim," and the latter cannot be enlarged by the language used in other parts of the specification.
2. So limited, the invention for which letters patent No. 58,447 were granted, Oct. 2, 1866, to Edward Mellon for an improvement in the mode of attaching tires to the wheels of locomotives consists simply in rounding off that corner of the inner side of the tire which fits into the reentrant corner made by the flange upon the rim of the wheel center so as to prevent the corner of the tire from indenting and sinking into the periphery of the wheel center.