Legal Opinion
Del Mar Engineering Laboratories v. Physio-Tronics, Inc.
Court of Appeals for the Ninth Circuit
Decided March 23, 1981No. 78-3515PublishedCited by 22 opinions
1Opinion of the Court
BOOCHEVER, Circuit Judge:
Del Mar Engineering Laboratories (Del Mar) is the assignee of patent # 3,267,934. Claims one through eight of this patent relate to a device for measuring electrically the “ST segment” of the human heartbeat. Physio-Tronics, Inc., is the southwest distributor of Quinton Instruments, a Washington corporation. Del Mar brought this suit against Physio-Tronics alleging infringement of its patent by two devices produced by Quinton Instruments.
Physio-Tronics contends that the patent is invalid: first, because William Thornton, the original patentee, deceptively failed to…
2Cases cited14 opinions
- Graham v. John Deere Co. of Kansas CitySupreme Court of the United States · 1966
- United States v. AdamsSupreme Court of the United States · 1966
- Elizabeth v. Pavement Co.Supreme Court of the United States · 1878
- Harry A. Pursche v. Atlas Scraper and Engineering Co., a Corporation, Atlas Scraper and Engineering Co., a Corporation v. Harry A. PurscheCourt of Appeals for the Ninth Circuit · 1962
- Brooks Walker v. General Motors Corporation and Les Vogel Chevrolet CompanyCourt of Appeals for the Ninth Circuit · 1966
9 more not listed; retrieve them via the Exa API.
3Cited by22 opinions
- Del Mar Avionics, Inc., Appellee/cross-Appellant v. Quinton Instrument Co., Appellant/cross-AppelleeCourt of Appeals for the Federal Circuit · 1987
- Spencer D. Stewart, Et Ux. v. Commissioner of Internal RevenueCourt of Appeals for the Ninth Circuit · 1983
- Wilden Pump & Engineering Co., a Corporation v. Pressed & Welded Products Co., a CorporationCourt of Appeals for the Ninth Circuit · 1981
- Bristol Locknut Company, Plaintiff/appellee/cross-Appellant v. Sps Technologies, Inc., Defendant/appellant/cross-AppelleeCourt of Appeals for the Ninth Circuit · 1982
- Peter A. Hammerquist v. Clarke's Sheet Metal, Inc.Court of Appeals for the Ninth Circuit · 1981
17 more not listed; retrieve them via the Exa API.