Patents by Inventor Gerd Keitel

Gerd Keitel 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).

  • Temperature measuring arrangement
    Patent number: 4830514
    Abstract: A temperature measuring arrangement employs a semiconductor element whose internal resistance depends on the temperature and the current direction and which is driven by an a.c. signal from an a.c. signal source. A measuring device determines the difference in semiconductor element conductivity depending on the polarity of the applied a.c. signal to provide an indication of the temperature being measured.
    Type: Grant
    Filed: October 5, 1982
    Date of Patent: May 16, 1989
    Assignee: U.S. Philips Corp.
    Inventors: Dieter Begehr, Gerd Keitel, Rainer Burmeister