Patents by Inventor Johan Liebe

Johan Liebe 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 arc tube heat shield
    Patent number: 4651048
    Abstract: A high-pressure discharge lamp provided with a cylindrical shield near an end and around and at a certain distance from the discharge envelope. The cylindrical shield is electrically insulated from current-conveying parts, so that migration of filling constituents through the wall of the discharge envelope is counteracted.
    Type: Grant
    Filed: March 26, 1986
    Date of Patent: March 17, 1987
    Assignee: U.S. Philips Corporation
    Inventor: Johan Liebe
  • High-pressure discharge lamp with shielded electrode
    Patent number: 4621216
    Abstract: The invention relates to a high-pressure discharge lamp having a discharge envelope (3) with a ceramic wall provided with at least one electrode (4). The electrode (4) comprises a rod (41) which is connected to a tubular lead-through member (40) and on which an emitter-containing element (42) is arranged. By means of a screening body (43), the emitter-containing element (42) is screened on its outer side. According to the invention, the screening body (43) extends with a constant cross-section from the tubular lead-through member (40) to the end of the emitter-containing element (42) facing the discharge path. Thus, an improved temperature control is obtained within the discharge envelope (3) during operation of the lamp.
    Type: Grant
    Filed: April 23, 1984
    Date of Patent: November 4, 1986
    Assignee: U.S. Philips Corporation
    Inventors: Johan Liebe, Andreas S. G. Geven, Antonius J. G. C. Driessen, Jan R. deBie