Patents by Inventor Bernardus Antonius Johannus Jacobs

Bernardus Antonius Johannus Jacobs 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: 4118734
    Abstract: A disc-shaped record carrier is described on which information is recorded in an optical structure of trackwise arranged areas and intermediate areas. By adapting the average dimensions of the areas to the average spatial frequencies on the record carrier a read signal can be obtained of sufficient modulation depth and minimal distortion. This is accomplished by increasing the track width with decreasing radius of the record carrier.
    Type: Grant
    Filed: October 29, 1976
    Date of Patent: October 3, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Gijsbertus Bouwhuis, Josephus Johannes Maria Braat, Bernardus Antonius Johannus Jacobs
  • 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