Patents by Inventor Dirk van Houwelingen

Dirk van Houwelingen 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).

  • Method of manufacturing a cathode ray tube
    Patent number: 6048240
    Abstract: To test a cathode ray tube or an apparatus comprising a cathode ray tube, a part of the electron gun is heated by means of high-frequency electromagnetic radiation. By virtue thereof, the warm-up period, that is the time which, after turning on the cathode ray tube, must elapse before the testing operation can be carried out, can be reduced, for example, from approximately 30 minutes to approximately 2 minutes.
    Type: Grant
    Filed: November 3, 1998
    Date of Patent: April 11, 2000
    Assignee: U.S. Philips Corporation
    Inventors: Johannes A. G. P. Damsteegt, Dirk Van Houwelingen
  • Method of curing a film
    Patent number: 5576050
    Abstract: A film provided on a cathode ray tube is cured by locally subjecting it to a flow of very hot air. The gas flow heats the film without heating the underlying display window. Said gas flow is used to scan the surface.
    Type: Grant
    Filed: August 8, 1995
    Date of Patent: November 19, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Dirk Van Houwelingen, Johannes A. G. P. Damsteegt, Johannes M. A. A. Compen
  • Electron tube with control electrode remote from anode
    Patent number: 4877996
    Abstract: An electron tube, for example, a transmitter tube of the triode type, comprising in an evacuated envelope a mesh or cage cathode (3) and an anode (1). By providing a control electrode (4) near the cathode (3) on the side thereof remote from the anode (1), the output power of the tube can be controlled by means of a potential difference between the control electrode (4) and the cathode (3).
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: October 31, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Dirk van Houwelingen, Jozephus J. M. Warringa