Patents by Inventor Theodorus C. J. M. Bertens

Theodorus C. J. M. Bertens 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).

  • Laminated product, compound used in the laminated product and optical information carrier provided with the laminated product
    Patent number: 5045373
    Abstract: A laminated product comprising substrate (7) and a thin layer (11, 12) of a dielectric compound formed from the oxide or the suboxide of gallium antimonide or indium antimonide, an optical information carrier containing such a thin layer, whereby said thin layer, dependent upon the oxygen content, may function as a recording layer 11 or as a transparent distance layer 12, as well as the suboxide of gallium antimonide or indium antimonide used in the laminated product.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: September 3, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Martinus M. Sens, Theodorus C. J. M. Bertens, Hendricus F. J. J. Van Tongeren, Johannes T. H. Thijssen
  • Dispenser cathode
    Patent number: 4350920
    Abstract: A compressed dispenser cathode having 1-15% by weight of Ba.sub.2 Sc.sub.2 O.sub.5 in a porous metal cathode body has an emission having a larger current density (exceeding 6 A/cm.sup.2) and a longer life (more than 3000 hours).
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: September 21, 1982
    Assignee: U.S. Philips Corporation
    Inventor: Theodorus C. J. M. Bertens
  • Method of manufacturing a magnetic head by photo-etching
    Patent number: 4224400
    Abstract: A method of manufacturing a magnetic head wherein a pattern is formed in a nickel-iron layer by means of a photo-etching process. The nickel-iron layer is provided with an auxiliary layer of titanium, titanium oxide or silicon oxide and with a photolacquer layer in a pattern which corresponds to the pattern desired in the nickel-iron layer. The lacquer layer pattern does not cover a part of the auxiliary layer and serves as an etching mask for the simultaneous etching of the auxiliary layer and the nickel-iron layer.
    Type: Grant
    Filed: July 23, 1976
    Date of Patent: September 23, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Gerrit J. Koel, Theodorus C. J. M. Bertens