Albany Steam Trap Co. v. Felthousen

The first of the four patents in controversy was granted to Helem Merrill, April 30, 1867, and the specific improvement in steam-beating apparatus which it describes consists in the devices for returning the water of condensation back into the boiler. The main contention of the partios is respecting the construction which should be placed upon the claims, especially upon the first and third claims of the patent, it being conceded by the experts for the defendant that the claims have not been anticipated by any of the earlier patents introduced in evidence by the defendant, if the claims are…