An explanation of the significance of new effect in established patent law can be found as long ago as 1822 in Evans v Eaton 20 U.S. 356 (1822) and its evidential nature was explained by Justice Bradley in Webster Loom v Higgins105 US 580 (1881), subsequently approved e.g. by Justice Brown in Carnegie Steel v Cambria Iron Co 185 US 402 (1902): It may be laid down as a general rule, though perhaps not an invariable one, that if… [read post]