Patents by Inventor Helmut Blume

Helmut Blume 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).

  • Covering a steel pipe having a welding seam with a thermoplastic coating
    Patent number: 4287223
    Abstract: A steel pipe with a thermoplastic cover has the coverage of a welding seam reinforced by hot air heating the cover along the plastic and extruding a strip of similar plastic thereon, followed by cold water spray cooling. The pipe is centered as to the position of the welding seam vis-a-vis the heating and extruding equipment during relative longitudinal movement.
    Type: Grant
    Filed: November 14, 1979
    Date of Patent: September 1, 1981
    Assignee: Mannesmann Aktiengesellschaft
    Inventors: Karl-Heinz Hackert, Helmut Blume