Patents by Inventor Abraham Coomans

Abraham Coomans 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).

  • High-pressure discharge lamp with improved electrodes
    Patent number: 4952841
    Abstract: The high-pressure discharge lamp has electrodes which comprise a tungsten rod (24) which projects inside the lamp vessel and around whose end (25) projecting inside the lamp vessel a tungsten wire portion (26) is helically wound. The ends (30, 31) of the helically wound wire portion (26) are located within the sheath (29) of this wire portion (26) and the end faces (32, 33) are rupture surfaces devoid of burrs.
    Type: Grant
    Filed: July 11, 1986
    Date of Patent: August 28, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Abraham Coomans, Wilhelmus C. der Kinderen, deceased, Friedrich J. de Haan, administrator
  • High-pressure discharge lamp having shielding means comprised of boron nitride
    Patent number: 4479071
    Abstract: The invention relates to a high-pressure metal halide lamp in which the filling of the discharge vessel also comprises an alkali metal. The discharge vessel is surrounded by an outer envelope. One electrode of the discharge vessel is connected to a current supply conductor extending between the discharge vessel and the outer envelope. A plate-shaped element is mounted between the discharge vessel and the outer envelope in such manner that, viewed from the discharge vessel, the current supply conductor is present substantially entirely behind the plate-shaped element.According to the invention, the plate-shaped element comprises boron nitride.Increase of the arc voltage of the lamp and increase of the color temperature of the radiation emitted by the lamp is prevented in this manner.
    Type: Grant
    Filed: March 8, 1982
    Date of Patent: October 23, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Germain R. T'Jampens, Abraham Coomans