Patents by Inventor Walter Langhans

Walter Langhans 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 of making seamless metal tubes
    Patent number: 3942352
    Abstract: A seamless pipe made by extrusion or piercing and having eccentric interior has the outside of one of its ends turned to concentric dimensions with its interior and is pulled through a peeling and scraping tool affixed to a positioning die, and over a mandrel which widens the pipe particularly in the zone of peeling.
    Type: Grant
    Filed: October 29, 1974
    Date of Patent: March 9, 1976
    Assignee: Kabel-und Metallwerke Gutehoffnungshutte AG
    Inventors: Walter Langhans, Otto Uhlmann, Norbert Stephan