Patents by Inventor Helmut Hilger

Helmut Hilger 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).

  • Molded part made of thermoplastic material
    Patent number: 5687996
    Abstract: A molded part has welding sleeve portions (2) which are each provided with a heating coil (3a, 3b) for joining to tubular parts. A cylindrical sleeve end part (7) can be tensioned by at least one tensioning system against the inserted tubular part, thus providing fixing and holding of the parts before welding and during welding.
    Type: Grant
    Filed: January 2, 1996
    Date of Patent: November 18, 1997
    Assignee: Georg Fischer Rohrleitungssysteme AG
    Inventors: Hans-Werner Steinmetz, Helmut Hilger, Dirk Alexander Petry
  • Molded connector for branch connections for a pipeline
    Patent number: 5601315
    Abstract: A molded connector for producing a branch connection for a pipeline has two heating windings which are connected to each other and by means of which the weld connection between the pipeline and the molded connector as well as the inserted molded branch part or a pipe is produced simultaneously.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: February 11, 1997
    Assignee: Georg Fischer Rohrleitungssysteme AG
    Inventors: Lars Bunger, Helmut Hilger
  • Welding sleeve and method for its manufacture
    Patent number: 5255943
    Abstract: A welding sleeve is disclosed comprising a sleeve member of thermoplastic weldable material having a resistor wire winding at the internal surface thereof.
    Type: Grant
    Filed: May 15, 1992
    Date of Patent: October 26, 1993
    Assignee: Georg Fischer Rohrleitungssysteme AG
    Inventors: Friedhelm Keller, Dirk Petry, Helmut Hilger