Patents by Inventor Hans Steck

Hans Steck 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).

  • Method for heated tool butt welding of tube and pipe of thermoplastic materials
    Patent number: 4288266
    Abstract: In a method for heated tool butt welding of pipe consisting of a thermoplastic material by placing or pressing the surfaces to be joined of the pipes to be welded into contact with a heated tool to form an inner weld bead at each end to be joined, subsequently heating the surfaces at a reduced contact pressure to the welding temperature and fitting the surfaces together under pressure after having removed the heated tool, the improvement for minimizing the formation of a protrusion within the resultant pipes which comprises pressing an elastic insert against the inner weld bead while joining said surfaces of said pipe together.
    Type: Grant
    Filed: July 9, 1979
    Date of Patent: September 8, 1981
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Klaus-Dieter Konrad, Rudolf Kellersohn, Hans Steck, Josef Schaub