Patents by Inventor Clemens A. Sonntag

Clemens A. Sonntag 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).

  • Ball point writing instrument
    Patent number: D279383
    Type: Grant
    Filed: September 6, 1983
    Date of Patent: June 25, 1985
    Assignee: Parker Pen Company
    Inventors: Thomas W. Hillebrand, Clemens A. Sonntag
  • Push button ball point pen
    Patent number: D285936
    Type: Grant
    Filed: February 24, 1984
    Date of Patent: September 30, 1986
    Assignee: The Parker Pen Company
    Inventors: Brian A. J. Booker, Harley A. Jung, Clemens A. Sonntag
  • Push button mechanical pencil
    Patent number: D285937
    Type: Grant
    Filed: February 24, 1984
    Date of Patent: September 30, 1986
    Assignee: The Parker Pen Company
    Inventors: Brian A. J. Booker, Harley A. Jung, Clemens A. Sonntag