Patents by Inventor Erhard Holtorf

Erhard Holtorf 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).

  • Hand operated stamp
    Patent number: 4182241
    Abstract: A hand operated stamp has only two parts, a resilient printing section and a firmer handling portion, both molded of plastic and being relatively flat. The printing section is tray-shaped to hold the handling portion, and the stamp can be molded together with other stamps connected by removable connecting pieces.
    Type: Grant
    Filed: January 31, 1978
    Date of Patent: January 8, 1980
    Assignee: Ferrero OHG
    Inventor: Erhard Holtorf