Legal Opinion
Deep Welding, Inc. v. Sciaky Bros., Inc.
Court of Appeals for the Seventh Circuit
Decided November 24, 1969No. 16707_1PublishedCited by 50 opinions
1Opinion of the Court
KERNER, Circuit Judge.
Plaintiff (Deep Welding) sued defendant (Sciaky) charging infringement of plaintiff’s United States Patent No. 2,-987,610 (Steigerwald) covering a method of welding using a controlled electron beam. Defendant asserted as affirmative defenses the invalidity of the patent, laches, and unclean hands (allegedly resulting from the establishment of a limited monopoly in unpatented electron beam welding machines by a parent corporation of plaintiff through improper use of the patent). The trial court found the patent valid, rejected Sciaky’s other defenses, found some…
2Cases cited47 opinions
- Graham v. John Deere Co. of Kansas CitySupreme Court of the United States · 1966
- Hotchkiss v. GreenwoodSupreme Court of the United States · 1851
- Graver Tank & Mfg. Co. v. Linde Air Products Co.Supreme Court of the United States · 1949
- Halliburton Oil Well Cementing Co. v. WalkerSupreme Court of the United States · 1946
- Universal Oil Products Co. v. Globe Oil & Refining Co.Supreme Court of the United States · 1944
42 more not listed; retrieve them via the Exa API.
3Cited by50 opinions
- Lektro-Vend Corp. v. Vendo Co.Court of Appeals for the Seventh Circuit · 1981
- Terrell J. Reese and Reese Products, Inc. v. Elkhart Welding and Boiler Works, Inc.Court of Appeals for the Seventh Circuit · 1971
- La Salle Street Press, Inc. v. McCormick and Henderson, Inc.Court of Appeals for the Seventh Circuit · 1971
- Ellipse Corporation, Cross-Appellant v. Ford Motor Company, Cross-AppelleeCourt of Appeals for the Seventh Circuit · 1971
- Chicago Rawhide Manufacturing Co. v. Crane Packing Co.Court of Appeals for the Seventh Circuit · 1975
45 more not listed; retrieve them via the Exa API.