Patents by Inventor Kai-Uwe Marquardt

Kai-Uwe Marquardt 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).

  • Dual component keyboard unit
    Patent number: D340445
    Type: Grant
    Filed: September 10, 1991
    Date of Patent: October 19, 1993
    Assignee: Marquardt GmbH
    Inventors: Kai-Uwe Marquardt, Ekkehard Sachs, Ralf Sauer
  • Keyboard
    Patent number: D341134
    Type: Grant
    Filed: September 10, 1991
    Date of Patent: November 9, 1993
    Assignee: Marquardt GmbH
    Inventors: Kai-Uwe Marquardt, Ekkehard Sachs, Ralf Sauer
  • Keyboard
    Patent number: D346376
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: April 26, 1994
    Assignee: Marquardt GmbH
    Inventors: Kai-Uwe Marquardt, Ralf Sauer
  • Keyboard
    Patent number: D365552
    Type: Grant
    Filed: September 2, 1993
    Date of Patent: December 26, 1995
    Assignee: Marquardt GmbH
    Inventors: Kai-Uwe Marquardt, Ralf Sauer