Patents by Inventor David L. Dahmen

David L. Dahmen 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 and machine for forming a hollow rivet
    Patent number: 4136417
    Abstract: The method and machine for forming a hollow rivet having a head at one end and an axially recessed shank at the other end, by means of placing a blank in a fixed die and performing the extruding operation on one end of the blank followed by a heading operation on the other end of the blank by a single blow of the heading hammer and then ejecting the hollow headed rivet from the fixed die.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: January 30, 1979
    Assignee: Remaches Industriales S.A.
    Inventors: David L. Dahmen, Luis Zapata