U.S. Supreme Court
Dalton v. Jennings, 93 U.S. 271 (1876)
Dalton v. Jennings
93 U.S. 271
Letters patent No. 124,340, issued to John Dalton, March 6, 1872, for "an alleged new and useful improvement in ladies' hair-nets," are void because his specification and claim precisely and accurately describe various fabrics which had been made and were in public use for a long time previous to his application.
This was a bill filed for an account, and for an injunction restraining the defendant from infringing Dalton's letters patent. Upon the final hearing of the cause, the court below dismissed the bill, and Dalton appealed here.