Patents by Inventor Gottfried Ehrenstein

Gottfried Ehrenstein 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).

  • Self-tapping screw
    Patent number: 4527932
    Abstract: For the purpose of assuring, during insertion in plastic, a highly stressable connection between screw and plastic with relatively small driving torques, a self-tapping screw is provided with a symmetrical thread profile whose thread angle (8) changes steadily from the crest (5) of the flank to the root (3) of the thread.
    Type: Grant
    Filed: March 3, 1983
    Date of Patent: July 9, 1985
    Assignee: Richard Bergner GmbH & Co.
    Inventors: Jurgen Onasch, Gottfried Ehrenstein