Patents by Inventor Wolfhart Dittrich

Wolfhart Dittrich 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).

  • Process for punching holes and slots in structural timber
    Patent number: 4071637
    Abstract: This invention relates to a process for introducing holes or straight or circular slots approximately normal to the surface in the vicinity of the surface of round timber and to an approximately predetermined depth for the purpose of facilitating the penetration of impregnating means into the surface zones of the timber to better protect against chemical and biological attacks.
    Type: Grant
    Filed: December 28, 1976
    Date of Patent: January 31, 1978
    Assignee: Eisenwerk Weserhutte AG
    Inventors: Wolfhart Dittrich, Helmut Heuer, W. F. G. Kamm, Thorwald Kipp, Gerhard Luhr, Erich Poggemeier