Doyle v. Spaulding

These two cases will he considered together, for reasons which will hereafter appear. On March 5, 1881, the complainant, Illingworth, commenced a suit in this court against the defendants for infringement of letters patent No. 166,700, dated August 17, *7451875, for “improvements in moulds for ingots.” The defendants answered, setting up, among other things, that said letters patent were void (1) on account of prior knowledge and use of the alleged invention; (2) because every substantial and material part of the invention was described and claimed in letters patent No. 99,299, and granted to…