Patents by Inventor Mark Wittmer

Mark Wittmer 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 direct bonding copper foils to oxide-ceramic substrates
    Patent number: 4505418
    Abstract: Method for directly bonding copper foils having a copper oxide layer to oxide-ceramic substrates by heating the ceramic substrate covered with the copper foil in an oxygen-containing atmosphere to a temperature above the eutectic temperature of Cu and Cu.sub.2 O, but below the melting temperature of copper in a vacuum furnace at a pressure of not more than 1 mbar while maintaining a furnace atmosphere with a partial oxygen pressure between 0.001 and 0.1 mbar.
    Type: Grant
    Filed: December 12, 1983
    Date of Patent: March 19, 1985
    Assignee: Brown, Boveri & Cie AG
    Inventors: Arno Neidig, Dietmar Berndt, Georg Wahl, Mark Wittmer