Patents by Inventor Friedhard Fehr

Friedhard Fehr 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).

  • Patent number: 4954804
    Abstract: A rotary potentiometer having a cylindrical or partially cylindrical resistance track and at least one electrode pair arranged at the resistance track's edges which are parallel to the cylinder axis. A tap is fixed to an adjusting component which is rotatable around and movable along the cylinder axis. The axial breadth of the resistance track correspondsd substantially to the stroke of the adjusting component along the cylinder axis. At the circumferential edges of the resistance track, at least one second electrode pair is arranged.
    Type: Grant
    Filed: March 3, 1989
    Date of Patent: September 4, 1990
    Assignee: Preh-Werke GmbH & Co. KG
    Inventors: Gottfried Berthold, Rudolf Limpert, Friedhard Fehr
  • Patent number: 4555745
    Abstract: A thick-film capacitor and a printed circuit are described, this capacitor being designed for implementation by printed-circuit technology, while the printed circuit contains capacitors of this type, together with the associated conducting paths.The capacitor dielectric comprises a screen-printable dispersion of dielectric filler substances in a polymeric material which can be cured at comparatively low temperatures, especially a polymeric resin from the group comprising polyurethane resins, polyester resins, epoxy resins and melamine formaldehyde resins. The use of a dielectric of this type enables lower curing temperatures to be used, in the region of approximately 200.degree. C., in contrast to conventional designs of thick-film capacitors with a dielectric containing a glass or ceramic frit, which require firing temperatures of the order of 1,000.degree. C.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: November 26, 1985
    Assignee: Preh Elektrofeinmechanische Werke Jakob Preh Nachf. GmbH & Co.
    Inventors: Gisela Westermeir, Friedhard Fehr