Patents by Inventor Ernst R. Kitzerow

Ernst R. Kitzerow 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: 4227823
    Abstract: A retractable ballpoint pen has a body and a point secured to a flexible tubular ink reservoir. The ink reservoir is secured to a rotatable element within the body, movement of which element causes the pen to be retracted and projected and during that movement the reservoir follows a generally circular path.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: October 14, 1980
    Assignee: Berendsohn AG
    Inventor: Ernst R. Kitzerow