Patents by Inventor Klaus Brummernhenrich

Klaus Brummernhenrich 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).

  • Ballpoint pen with visual window and sleeve
    Patent number: 6386780
    Abstract: A press-action ballpoint pen includes a hollow shank which has an elongated viewing window. A printed sleeve is rotationally mounted within the hollow shank for rotation past the viewing window upon actuation of a press-action mechanism which operates the ink cartridge.
    Type: Grant
    Filed: August 31, 1998
    Date of Patent: May 14, 2002
    Inventor: Klaus Brummernhenrich