Duff Mfg. Co. v. Kalamazoo Railroad Velocipede & Car Co.

WANTY, District Judge.

This suit is based on three patents, Nos. 455,993, 455,994, and 455,995, all dated July 14, 1891, granted to Josiah Barrett for improvements in lifting jacks, and assigned by him to the complainant. Claims 1 and 6 of 455,993 are alleged to be infringed, and these claims are in the following language:

“(1) In a jack, the combination of a bar having teeth on one side thereof, a pivotal lever, two pawls pivoted to said lever and having fingers rigid there-wiili, and a yielding tripping plate having lugs thereon, adapted to engage with -said fingers, and through the same draw…