Patents by Inventor Johannes A. T. Schellen

Johannes A. T. Schellen 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
    Patent number: 5339006
    Abstract: The invention relates to a high-pressure discharge lamp provided with a discharge vessel which is enclosed with intervening space by an outer bulb fitted with a lamp cap. The lamp is provided with an ignition circuit in which a fuse is included, which is placed in an oxidizing atmosphere.
    Type: Grant
    Filed: March 2, 1993
    Date of Patent: August 16, 1994
    Assignee: U.S. Philips Corporation
    Inventor: Johannes A. T. Schellen
  • High-pressure discharge lamp having solid state getter mounted on bimetallic element
    Patent number: 5325017
    Abstract: The invention relates to a high-pressure discharge lamp (2) provided with a discharge vessel (3) with a ceramic wall (3a) and provided with a bimetal element (11) which rests against the discharge vessel wall in the cold state of the lamp, and which is removed from the discharge vessel wall during lamp operation. The discharge vessel is surrounded by an outer bulb (30) with intervening space (6), in which space a solid-state getter (15) is provided. According to the invention, the solid-state getter is provided on the bimetal element.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: June 28, 1994
    Assignee: U.S. Philips Corporation
    Inventors: Johannes A. T. Schellen, Gerardus M. J. F. Luijks
  • High-pressure metal vapor discharge lamp
    Patent number: 4521716
    Abstract: The invention relates to a high-pressure metal vapor discharge lamp having an ignition auxiliary means (13) externally of the discharge vessel. The external ignition auxiliary means is connected electrically to a first main electrode (5) and in the inoperative condition of the lamp extends along the wall of the discharge vessel up to at most 3 mm beyond one end of a second main electrode (6). According to the invention the external ignition element extends at the level of the first main electrode over at most 3 mm along the first main electrode from the end of the first main electrode. In this manner a regular ignition of the lamp is obtained, variation in the ignition voltage pulse required for ignition being considerably restricted.
    Type: Grant
    Filed: September 9, 1982
    Date of Patent: June 4, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis A. J. Jacobs, Johannes A. T. Schellen, Anthonius P. Van Der Vleuten
  • Method vapor discharge lamp having specific range of xenon pressures
    Patent number: 4314175
    Abstract: The invention relates to a high-pressure sodium vapor discharge lamp which has a discharge vessel in which xenon and a xenon-absorbing substance are present. The xenon is absorbed partly in the absorbing substance. When the temperature is raised xenon is released.According to the invention, the xenon pressure P at room temperature has a value which satisfies 1 kPa.ltoreq.P.ltoreq.25 kPa. Herewith it is achieved that a lamp is obtained having good ignition properties and a high xenon pressure in the operating condition of the lamp, resulting in a large luminous flux.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: February 2, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis A. J. Jacobs, Johannes A. T. Schellen, Gijsbert Kuus