Patents by Inventor Paul V. Crawshaw

Paul V. Crawshaw has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Tungsten halogen incandescent lamps containing mixed halogens
    Patent number: 4532455
    Abstract: The invention provides a tungsten halogen linear incandescent lamp having a gas fill comprising a mixture of CHI.sub.3 and (PNBr.sub.2).sub.3. Gas fills according to the invention comprise from 6 to 32 micrograms of (PNBr.sub.2).sub.3 per c.c. of the lamp internal volume with a ratio of CHI.sub.3 to (PNBr.sub.2).sub.3 of from 1:1 to 5:1 and result in lamps having a increased efficacy and a life of more than 2,000 hours.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: July 30, 1985
    Assignee: Thorn EMI plc
    Inventors: Ian Connor, Paul V. Crawshaw