Patents by Inventor Walter Birgel

Walter Birgel 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).

  • Patent number: 4925083
    Abstract: A ball bonding method and apparatus is disclosed including gold wire bonding. The steps include positioning and lowering a bond capillary (10) with a bond wire (11) including a flame-scarfed bond wire ball (12) downwardly onto a first bonding pad (17). The bond wire ball (12) is welded by heating and applying a bonding pressure or ultrasonic, or both. The bond capillary (10) is raised and moved to form a loop (21), followed by the step of welding the bond wire (11) to a second bonding pad (16) using heating and applying pressure, ultrasonic or both. The bond capillary (10) is raised to a tail-length position (29) and the bond wire (11) is broken by a vertical pulling force created by closing a clamp (13) onto the wire and raising the clamp (13) engaging the bond wire (11). The end of the free bond wire is flame-scarfed to form a bond wire ball (12).
    Type: Grant
    Filed: October 5, 1988
    Date of Patent: May 15, 1990
    Assignee: Emhart Deutschland GmbH
    Inventors: Farhad Farassat, Walter Birgel