Patents by Inventor Bram Johan Derksema

Bram Johan Derksema 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).

  • Gas-discharge laser
    Patent number: 4052681
    Abstract: A gas-discharge laser having a Brewster window near at least one of the reflectors which is secured directly to the laser tube. The Brewster window is secured to a surface of the laser tube and a normal to the window makes an angle equal to the Brewster angle with the axis of the laser tube. The surface may be a slot in the laser tube or a recessed end face of the laser tube near a reflector. An advantage is that the Brewster window may have any convenient diameter and that the laser tube need not be drilled to form a cavity.
    Type: Grant
    Filed: December 18, 1975
    Date of Patent: October 4, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Kornelis Bulthuis, Bram Johan Derksema, Hendrik Tjalling Dijkstra, Johannes VAN DE Wal
  • Gas discharge laser
    Patent number: 3986141
    Abstract: A gas discharge laser in which a plane parallel transparent plate whose normal encloses an angle with the axis of the laser tube equal to the Brewster angle is arranged in at least one of the ends of the laser tube. The plate is secured to the adjacent reflector so that the plate can easily be replaced.
    Type: Grant
    Filed: February 14, 1975
    Date of Patent: October 12, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Kornelis Bulthuis, Johannes Van der Wal, Bram Johan Derksema