Kalamazoo Ry. Supply Co. v. Duff Mfg. Co.
Court of Appeals for the Sixth Circuit
Appeal from the Circuit Court of the United States for the Western District of Michigan. This was a bill by the Duff Manufacturing Company against the Kalamazoo Railway Supply Company for an injunction and for an account and recovery of damages for the alleged infringement of letters patent No. 312,-316, issued February 17, 1885, to Josiah Barrett.
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Appeal from the Circuit Court of the United States for the Western District of Michigan. This was a bill by the Duff Manufacturing Company against the Kalamazoo Railway Supply Company for an injunction and for an account and recovery of damages for the alleged infringement of letters patent No. 312,-316, issued February 17, 1885, to Josiah Barrett. Claim 3 is the one specifically alleged to have been infringed by the defendant, and is as follows: “(3) In a lifting jack, a lever having its inner end composed of a stem provided with curved seats, and of side plates having openings in line with…
1Opinion of the CourtClark, District Judge
Two points of advantage are insisted upon in the improvement covered by claim 3 as involving invention as distinguished from mere mechanical improvement, such as would be apparent to any one skilled in the art. The advantages are described by one of the machinists, introduced ¿s a witness as being;
“The great strength and durability of the jack, the construction giving an extra length of bearing or wearing surface, and great strength between tlie pawl body and its shaft. The strength in the support for the pawl was obtained by the seating of this shaft for its full length in the handle, the…
2Cases cited15 opinions
- The Barbed Wire PatentSupreme Court of the United States · 1892
- Topliff v. TopliffSupreme Court of the United States · 1892
- Smith v. Goodyear Dental Vulcanite Co.Supreme Court of the United States · 1877
- National Hollow Brake-Beam Co. v. Interchangeable Brake-Beam Co.Court of Appeals for the Eighth Circuit · 1901
- Farrar v. ChurchillSupreme Court of the United States · 1890
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3Cited by8 opinions
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- Cincinnati Traction Co. v. PopeCourt of Appeals for the Sixth Circuit · 1913
- Electric Controller & Supply Co. v. Westinghouse Electric & Mfg. Co.Court of Appeals for the Sixth Circuit · 1909
- White v. WanseyCourt of Appeals for the Sixth Circuit · 1902
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