Patents by Inventor Dirk Alexander Petry

Dirk Alexander Petry 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).

  • Welding sleeve of thermoplastic material with indicator
    Patent number: 6198081
    Abstract: A shaped part formed as a welding sleeve, consisting of thermoplastic material with a resistance wire winding arranged on its inner circumference, having at least one weld indicator. The indicator consists of a stem which is formed from the material of the body of the shaped part or sleeve. The stem prevents the material which comes under increased pressure upon the welding operation, and is urged towards the surface of the sleeve, from passing into the free space, by the resting against a corresponding surface of the sleeve recess.
    Type: Grant
    Filed: June 13, 1995
    Date of Patent: March 6, 2001
    Assignee: Georg Fischer Rohrleitungssysteme AG
    Inventors: Hans Werner Steinmetz, Alfred Messmer, Dirk Alexander Petry
  • Process and means for welding corrugated tubes and/or compound tubes and weld connection produced thereby
    Patent number: 5772824
    Abstract: In a process for the connecting of plastic tubes the wall of which has a corrugated cross section by electro-thermal welding, filling cores of plastic are inserted in the corrugation troughs of the tubes to be connected on both sides of a welding joint in order to form a resting surface on the outer circumference of the tubes and an electric heating mat which surrounds the resting surface of all filling cores is placed on the resting surface.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: June 30, 1998
    Assignee: Georg Fischer Rohrleitungssysteme AG
    Inventors: Hans-Werner Steinmetz, Dirk Alexander Petry
  • 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
  • Welding sleeve for plastic pipe
    Patent number: 5674588
    Abstract: A welding sleeve includes a sleeve body having a recess for receiving a plug contact. The recess has sidewalls and a bottom wall. The bottom wall is provided with a projection which defines with the side walls of the recess a pair of slots. The plug contact includes an insertion part adapted to be received within the recess. The insertion part includes leg portions to be received in the slots of the recess and a slit between the legs adjacent the top surface of the projection. The slit receives a portion of the heating element which rests on the top surface of the projection. The width (b) of the slit is less than the diameter (d) of the heating element so as to insure good electrical contact.
    Type: Grant
    Filed: June 12, 1995
    Date of Patent: October 7, 1997
    Assignee: Georg Fischer Rohrleitungssysteme AG
    Inventors: Erasmo Porfido, Dirk Alexander Petry