Patents by Inventor Fritz Runkel

Fritz Runkel 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).

  • Plug for plug rolling
    Patent number: 4031738
    Abstract: The plug is assembled from three parts held against the mandrel by a tie rod which is screwed into the front and guiding part. A spacer is keyed to the latter part as well as to the tie rod, whereby tie rod keying is provided though flat surface portions interrupting the cylindrical surface portions of the spacer bore and the tie rod, while the guiding part and spacer are mutually keyed through axially aligned square portions and a clip thereon.
    Type: Grant
    Filed: August 21, 1975
    Date of Patent: June 28, 1977
    Assignee: Mannesmannrohren-Werke AG.
    Inventors: Wolfram Schonfeld, Armin Philipps, Fritz Runkel