Patents by Inventor Elliot J. Epner

Elliot J. Epner 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 hole forming
    Patent number: 4223547
    Abstract: A dieless method of hot forming a hole through a metal part comprising locally heating the part followed by indenting opposite sides of the part and extruding the displaced metal centrally of the indentations to form a thin annular wall section between the indentations and then punching out the thin wall section to complete formation of the hole.
    Type: Grant
    Filed: December 11, 1978
    Date of Patent: September 23, 1980
    Assignee: General Motors Corporation
    Inventor: Elliot J. Epner