Patents by Inventor Gerhard Wolfel

Gerhard Wolfel 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).

  • Sealing material on the basis of polytetrafluoroethylene fibers
    Patent number: 4157328
    Abstract: The invention describes a sealing material from polytetrafluoroethylene fibers, whose staple length is in the range of from 1 to 20 mm. They are intimately mixed with graphite; oil and finely divided polytetrafluoroethylene being advantageously added. The portion of PTFE fibers is at least 50% by weight, the portion of graphite is from 10 to 30% by weight, and the portion of finely divided PTFE is from 5 to 15% by weight. As PTFE fibers there are also used those which have been obtained by machining sintered PTFE resin. The sealing material is formed into tablets or half-rings.The seals prepared are marked by their applicability at uncommonly high pressures.
    Type: Grant
    Filed: September 15, 1977
    Date of Patent: June 5, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Beyer, Gerhard Wolfel