Moon-Hopkins Billing Mach. Co. v. Dalton Adding Mach. Co.
Court of Appeals for the Eighth Circuit
Appeal from the District Court of the United States for the Eastern District of Missouri; David P. Dyer, Judge. Suit in equity by the Dalton Adding Machine Company and another against the Moon-Hopkins Billing Machine Company and others. Decree for complainants, and defendants appeal.
1Opinion of the Court
HOOK, Circuit Judge.
This is a suit by the Dalton Adding Machine Company and the Addograph Manufacturing Company against the Mooii-Hopkins Billing Machine Company and John C. Moon and Hubert Hopkins, its president and vice president, for infringement of patent No. 1,039,130, dated September 24, 1912, for a new and useful improvement in adding and writing machines. The plaintiffs were awarded a decree of injunction upon final hearing ([D. C.] 223 Fed. 51), and the defendants appealed. There are two questions in the case: (1) Whether defendants arc estopped from, questioning the patent in suit…
2Cases cited7 opinions
- Computing Scale Co. of America v. Automatic Scale Co.Supreme Court of the United States · 1907
- Royer v. CoupeSupreme Court of the United States · 1892
- Noonan v. Chester Park Athletic Club Co.Court of Appeals for the Sixth Circuit · 1900
- Phoenix Caster Co. v. SpiegelSupreme Court of the United States · 1890
- Johnson Furnace & Engineering Co. v. Western Furnace Co.Court of Appeals for the Eighth Circuit · 1910
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3Cited by10 opinions
- Westinghouse Electric & Manufacturing Co. v. Formica Insulation Co.Supreme Court of the United States · 1924
- Freeman v. AltvaterCourt of Appeals for the Eighth Circuit · 1933
- Pressed Steel Car Co. v. Union Pac. R.Court of Appeals for the Second Circuit · 1920
- Evr-Klean Seat Pad Co. v. Firestone Tire & Rubber Co.Court of Appeals for the Eighth Circuit · 1941
- R. H. Buhrke Co. v. Brauer Bros. Mfg. Co.Court of Appeals for the Eighth Circuit · 1929
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