Patents by Inventor Gerrit Berend Gerritsen

Gerrit Berend Gerritsen 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).

  • Patent number: 4057831
    Abstract: A mother for manufacturing long-playing video records is provided by (1) selectively exposing a photoresist disposed as the outer layer on a substrate comprising a disc-shaped plate, a thin layer of base material, e.g., an oxide of nitride, adhering to the plate and a thin metal layer, e.g., chromium, silver, nickel or titanium, coating the base material layer, (2) removing non-activated sections of the photoresist layer and (3) sputter or chemically etching the thin metal and base material layers in sections corresponding to the removed sections of the photoresist layer.
    Type: Grant
    Filed: August 11, 1976
    Date of Patent: November 8, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Bernardus Antonius Johannus Jacobs, Johannes VAN DER Wal, Gerrit Berend Gerritsen
  • Patent number: 3969575
    Abstract: In an opto-electronic focus detection system for determining a deviation between the plane of focussing of an objective and a radiation-reflecting surface the path of a focussing beam which is reflected by said surface includes an assembly of two radiation-sensitive detection elements. The difference in the output signals of said elements is proportional to said deviation. By disposing a lenslike element of which only the outer zone has a lens action before the detection elements, the measuring range can be extended while maintaining the sensitivity for small deviations.
    Type: Grant
    Filed: December 6, 1974
    Date of Patent: July 13, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Gerrit Berend Gerritsen, Gerard Eduard VAN Rosmalen