Patents by Inventor Gerhard Zwingmann

Gerhard Zwingmann 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).

  • Gold free alloys for firing on ceramic compositions
    Patent number: 4382909
    Abstract: There is provided a gold free alloy for firing on ceramic compositions, especially for dental purposes consisting essentially of 1-70 weight % palladium, 0.1-35 weight % chromium, and the balance consisting essentially of cobalt. There can also be present up to 1 weight % boron, up to 20 weight % molybdenum and/or tungsten, up to 8 weight % scandium, yttrium, lanthanum and/or the rare earths and up to 5 weight % aluminum, silicon, tin, indium and/or gallium.
    Type: Grant
    Filed: March 6, 1981
    Date of Patent: May 10, 1983
    Assignee: Degussa Aktiengesellschaft
    Inventor: Gerhard Zwingmann