Patents by Inventor Hans Grigull

Hans Grigull 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).

  • Production of plastic-filler mixtures
    Patent number: 3969314
    Abstract: In the formation of mixtures of plastic and fillers, the stability of the mixture is improved by preliminarily intensively predrying the fillers and then mixing the plastic and fillers together while maintaining the mixture completely free of moisture.
    Type: Grant
    Filed: July 3, 1974
    Date of Patent: July 13, 1976
    Assignee: Leybold-Heraeus GmbH & Co. KG
    Inventor: Hans Grigull