Patents by Inventor Alexander Voelcker

Alexander Voelcker 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).

  • Precision attachments for dental technology capable of being cast on
    Patent number: 5833462
    Abstract: Precision attachments containing a titanium-containing gold alloy which is covered with a gold film, capable of being cast on, which have a golden yellow color, are extremely corrosion-resistant and, despite base metal constituents, form no oxides at the place of casting-on.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: November 10, 1998
    Assignee: Degussa Aktiengesellschaft
    Inventors: Bernd Kempf, Hans Martin Ringelstein, Alexander Voelcker, Ulrich Birkholz
  • Cadmium-free silver alloy brazing solder, method of using said solder, and metal articles brazed with said solder
    Patent number: 5531962
    Abstract: Cadmium-free brazing solders with working temperatures under 630.degree. C. containing 45 to 80 wt. % silver, 14 to 25 wt. % copper 10 to 25 wt. % gallium, 1 to 7 wt. % zinc and 0 to 5 wt. % indium and/or tin. The alloys have good cold workability and ductility.
    Type: Grant
    Filed: August 3, 1994
    Date of Patent: July 2, 1996
    Assignee: Degussa Aktiengesellschaft
    Inventors: Wolfgang Weise, Alexander Voelcker, Dieter Kaufmann, Willi Malikowski, Joerg Beuers, Harald Krappitz
  • Use of silver alloys as cadium-free brazing solder
    Patent number: 5352542
    Abstract: Cadmium-free brazing solders which also have working temperatures under 630.degree. C. containing 45 to 80 wt. % silver, 5 to 25 wt. % copper, 10 to 25 wt. % gallium, and 0.1 to 5 wt. % indium and/or tin.
    Type: Grant
    Filed: September 1, 1993
    Date of Patent: October 4, 1994
    Assignee: Degussa Aktiengesellschaft
    Inventors: Alexander Voelcker, Joerg Beuers, Sigurd Joensson, Dieter Kaufmann, Georg Ptaschek, Wolfgang Kaster
  • Use of a cadmium-free silver alloy as brazing solder (III)
    Patent number: 5341981
    Abstract: Cadmium-free brazing solders with working temperatures under 630.degree. C. containing 45 to 80 wt. % silver, 5 to 13 wt. % copper, 10 to 25 wt. % gallium, 8 to 20 wt. % zinc, and 0 to 5 wt. % indium and/or tin.
    Type: Grant
    Filed: September 1, 1993
    Date of Patent: August 30, 1994
    Assignee: Degussa Aktiengesellschaft
    Inventors: Wolfgang Weise, Alexander Voelcker, Dieter Kaufmann, Willi Malikowski, Joerg Beuers, Harald Krappitz