Patents by Inventor William B. Grupen

William B. Grupen 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).

  • Fabrication of film resistor circuits
    Patent number: 4284970
    Abstract: A method of fabricating thin and thick film resistors which results in stable resistance characteristics, ability to withstand high current or voltage and a precise method of trimming small resistors. After the resistor film (20) and contacts (22 and 23) thereto are formed, the resistors are trimmed by a cut (24) along the length dimension so that the width of the current path is reduced uniformly. The waste portion of the resistor is then separated from the circuit by a cut (27) along its width. Current crowding in the vicinity of the cut is therefore essentially eliminated.
    Type: Grant
    Filed: August 9, 1979
    Date of Patent: August 18, 1981
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Lloyd Berrin, Howard M. Cohen, William B. Grupen, James D. McElroy