Legal Opinion
Perfect Circle Co. v. Hastings Mfg. Co.
Court of Appeals for the Sixth Circuit
Decided March 4, 1937No. 7115PublishedCited by 15 opinions
1Opinion of the Court
SIMONS, Circuit Judge.
The appellant complains of a decree, holding invalid for want of invention Tee-tor patent No. 1,414,796, issued May 2, 1922, for improvement in engines. .
The Teetor patent is for a combination in an engine, with the cylinder thereof of a hollow piston having a circumferential groové. and a packing ring within the groove. The combination of three such elements is, of course, old. The reciprocating piston within a hollow cylinder for the compression of steam or explosive gases was the conventional assembly in steam and internal combustion engines of the four-stroke type…
2Cases cited9 opinions
- Columbia Motor Car Co. v. C. A. Duerr & Co.Court of Appeals for the Second Circuit · 1911
- Weir Frog Co. v. PorterCourt of Appeals for the Sixth Circuit · 1913
- Jackson Fence Co. v. Peerless Wire Fence Co.Court of Appeals for the Sixth Circuit · 1915
- Grand Rapids Refrigerator Co. v. StevensCourt of Appeals for the Sixth Circuit · 1928
- Kodel Electric & Mfg. Co. v. Warren Telechron Clock Co.Court of Appeals for the Sixth Circuit · 1933
4 more not listed; retrieve them via the Exa API.
3Cited by15 opinions
- United States Gypsum Co. v. Consolidated Expanded Metal CompaniesCourt of Appeals for the Sixth Circuit · 1942
- Cleveland Trust Co. v. Schriber-Schroth Co.Court of Appeals for the Sixth Circuit · 1937
- Hazeltine Corporation v. General Motors CorporationCourt of Appeals for the Third Circuit · 1942
- Harvey v. LevineCourt of Appeals for the Sixth Circuit · 1963
- The Buffalo-Springfield Roller Company v. The Galion Iron Works Manufacturing CompanyCourt of Appeals for the Sixth Circuit · 1954
10 more not listed; retrieve them via the Exa API.