Patents by Inventor Albert Bischof

Albert Bischof 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).

  • Torsion spring powered door
    Patent number: 4804238
    Abstract: An access door has a frame formed with longitudinally extending channels which receive a closure element for sliding therealong. A torsion spring secured to the frame and to the closure element maintains the closure element in an open or closed position.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: February 14, 1989
    Assignee: American Telephone and Telegraph Company - AT&T Teletype
    Inventors: Albert Bischof, Norbert A. Rumps, Jr.
  • Multifunction communication controller
    Patent number: D295976
    Type: Grant
    Filed: November 14, 1985
    Date of Patent: May 31, 1988
    Assignee: AT&T Teletype Corporation
    Inventors: Leonard R. Aremka, Albert Bischof, Detlef A. Brodrueck, Donald M. Genaro, Chris G. Johnson