Patents by Inventor Jan van Werkhoven

Jan van Werkhoven 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 vessel having a UV radiation absorbing portion of quartz glass
    Patent number: 4307315
    Abstract: High-pressure discharge lamp according to the invention have a quartz glass lamp vessel (1) which consists locally of UV-absorbing quartz glass (shaded region 2). During operation of the lamps the normally colder wall parts of the lamp vessel in this region thus assume a higher temperature, as a result of which the efficiency of the lamp is increased while said regions (2) nevertheless remain transparent to visible radiation.
    Type: Grant
    Filed: December 21, 1978
    Date of Patent: December 22, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Charles C. E. Meulemans, Gerardus H. A. M. van der Steen, Jan van Werkhoven
  • Flashlamp unit
    Patent number: 4154569
    Abstract: A flashlamp unit having a plurality of flashlamps secured to a support on which an electrical circuit is printed. The flashlamps are connected to the circuit which includes break switches. The support with the electrical circuit and break switches has such a construction that the electrical conductors of the break switches and the circuit can be provided in the same operational step.
    Type: Grant
    Filed: May 6, 1977
    Date of Patent: May 15, 1979
    Assignee: U.S. Philips Corporation
    Inventor: Jan van Werkhoven
  • Flash array
    Patent number: 4148093
    Abstract: A flash array has at least two combustion flash lamps and an indicator which indicates whether a lamp has or has not flashed. The indicator consists mainly of a melting strip which is constructed as a radiation-sensitive switch contact and which is part of the electric circuit of the flash array.
    Type: Grant
    Filed: July 1, 1976
    Date of Patent: April 3, 1979
    Assignee: U.S. Philips Corporation
    Inventor: Jan van Werkhoven
  • Flash array provided with a high voltage combustion flash lamp
    Patent number: 4126409
    Abstract: The invention relates to a flash array provided with a number of high voltage combustion flash lamps which each cooperate with a single reflector sheet of an electrically conducting material. This reflector sheet is provided with holes; when a lamp is flashed a radiation-sensitive switching contact is affected via one of the holes.According to the invention the radiation-sensitive contacts open responsive to radiation. These contacts and the reflectors are connected to one another via a low-ohmic connection and whereby further a lamp, whose turn has not yet come, is short circuited. These measures result in the fact that the chance for premature ignition of a lamp is extremely small.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: November 21, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Johannes G. Bok, Bauke J. Roelevink, Jan VAN Werkhoven
  • Flash array provided with at least two combustion flash lamps
    Patent number: 4087724
    Abstract: A flash array provided with a number of high voltage combustion flash lamps which are ignited by means of a piezo element. The flashing of two lamps at the same time is prevented by means of melting strips.According to the invention the igniting pulse for a second lamp of the device is passed on via a capacitive circuit element which is formed by the flashed first lamp or a separate capacitor. By using such a capacitor circuit element instead of an ohmic resistance undesired loss of heat is avoided.
    Type: Grant
    Filed: May 5, 1976
    Date of Patent: May 2, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Jan van Werkhoven, Bauke Jacob Roelevink