Patents by Inventor Edwin Drewitz

Edwin Drewitz 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).

  • Conductive plastic multi-turn potentiometer
    Patent number: 4152687
    Abstract: A resistance element comprises an insulating cylinder having a helical thread groove on the outer surface thereof. A resistive channel is supported by the groove and a multi-strand wiper is guided by a follower which rides in the root of the channel. The resistance material on the sides of the groove may be notched for purposes of calibration.
    Type: Grant
    Filed: October 27, 1977
    Date of Patent: May 1, 1979
    Assignee: Litton Systems, Inc.
    Inventor: Edwin Drewitz