Patents by Inventor Clarence Zierhut

Clarence Zierhut 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).

  • Writing instrument
    Patent number: D252691
    Type: Grant
    Filed: February 2, 1978
    Date of Patent: August 21, 1979
    Assignee: The Gillette Company
    Inventors: Curtis L. Malm, Clarence Zierhut
  • Writing instrument
    Patent number: D257465
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: October 28, 1980
    Assignee: The Gillette Company
    Inventor: Clarence Zierhut
  • Writing instrument
    Patent number: D259727
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: June 30, 1981
    Assignee: The Gillette Company
    Inventor: Clarence Zierhut