Patents by Inventor Heinz Nyffeler

Heinz Nyffeler 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).

  • Electrically weldable socket for joining pipe members
    Patent number: 4530521
    Abstract: A socket for joining the ends of conduits, pipe or the like comprising a body of thermoplastic material in which is embedded, in a helical coil, a resistance wire strand formed of a plurality of juxtaposed individual thin wire elements, the wire elements being in part spaced from one another, to form gaps allowing for expansion of or movement of the wire elements without overall expansion or movement of the strand.
    Type: Grant
    Filed: March 22, 1984
    Date of Patent: July 23, 1985
    Assignee: Von Roll AG
    Inventors: Heinz Nyffeler, Guido Banholzer