Patents Assigned to Hubert J. Koch
  • Washer for screws
    Patent number: 5201627
    Abstract: A ring-shaped washer (10) especially for wood screws (28) has an external circumferential edge area, which is directed downwards and cuts the wood (26) when the washer is being driven into it. At the same time the wood below the washer is compressed. This primarily serves to avoid a splitting up of the wood when screwing in the wood screw (28) and at the same time to increase the strength of the screwed connection.
    Type: Grant
    Filed: August 14, 1990
    Date of Patent: April 13, 1993
    Assignee: Hubert J. Koch
    Inventor: Marita Biedenbach