Patents by Inventor Robertus P. C. Van Tulden

Robertus P. C. Van Tulden 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).

  • Electric halogen incandescent lamp
    Patent number: 4159438
    Abstract: Lamps having a gas filling containing bromine and hydrogen can be given a very long life without the addition of iodine to the gas filling by constructing and proportioning the internal tungsten current supply conductors according to the invention.The internal current supply conductors consist of a tungsten wire around the end of which a tungsten wire is wound helically having turns axially interspersed with the end turns of the filament.
    Type: Grant
    Filed: March 10, 1978
    Date of Patent: June 26, 1979
    Assignee: U.S. Philips Corporation
    Inventors: Leon F. M. Ooms, Robertus P. C. Van Tulden