Comptograph Co. v. Mechanical Accountant Co.
U.S. Circuit Court for the District of Rhode Island
In Equity. Suit for infringement of letters patent No. 465,255, for a computing machine, granted to D. E. Felt December 15, 1891. On motion for preliminary injunction.
1Opinion of the Court
BROWN, District Judge.
This suit is for infringement of letters patent No. 465,255, to D. E. Felt, dated December 15, 1891, for improvements in recording computing machines. The subject-matter of claims 7 and 8 is “subtraction cut-offs.” Claims 9, 10, 11, and 12 relate to means for returning all numeral wheels to zero.
In performing subtraction on an adding machine, the numeral wheels are given the same movements as in addition. Subtraction is performed by the addition of complementary numbers. Since the numeral wheels rotate as in addition, the carrying-mechanism, whereby a complete rotation…
2Cases cited3 opinions
- Kokomo Fence MacHine Co. v. KitselmanSupreme Court of the United States · 1903
- Office Specialty Manuf'g Co. v. Globe Co.U.S. Circuit Court for the District of Southern Ohio · 1895
- Colt's Patent Firearms Mfg. Co. v. WessonCourt of Appeals for the First Circuit · 1903
3Cited by1 opinion
- Comptograph Co. v. Mechanical Accountant Co.U.S. Circuit Court for the District of Rhode Island · 1905