Patents by Inventor Josef Rothaut

Josef Rothaut 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: 4863514
    Abstract: There is provided a material for dentures having metallic matrix, containing 0.5-30 volume % glass having a softening temperature above C. and/or ceramic particles having a maximum grain size of 40 .mu.m.
    Type: Grant
    Filed: February 8, 1989
    Date of Patent: September 5, 1989
    Assignee: Degussa Atiengesellschaft
    Inventors: Werner Groll, Josef Rothaut
  • Patent number: 4689197
    Abstract: A denture with a metallic microstructure and with low shrinkage and porosity is produced by metallurgical sintering by providing a multimodal size distribution of coarse and fine fractions of metal powder, optionally also with glass or ceramic powder, converting this powder mixture with water into a slip, modelling the denture with this, and sintering the slip at a temperature which exceeds the solidus temperature of at least one component of the powder mixture.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: August 25, 1987
    Assignee: Degussa Aktiengesellschaft
    Inventors: Werner Groll, Josef Rothaut, Angela Klaus, Rudi Steinke
  • Patent number: 4576790
    Abstract: Low gold dental alloys, especially for firing on dental porcelains, should be easily worked, result in no discolorations and bubble formation in the firing, and have a physiologically replaceable hardness and a low melting interval. These properties are shown by alloys having 20 to 35 wt. % gold and 45 to 65 wt. % palladium if they also contain(a) 6 to 15 wt. % copper and 0 to 10 wt. % nickel,(b) 0 to 12 wt. % indium, 0 to 12 wt. % tin, and 0 to 4 wt. % gallium, with the proviso that the sum of the content of indium and tin added to two and one-half times the gallium content must give a value between 5 and 15 wt. %,(c) 0.1 to 1 wt. % iridium and/or rhenium and/or ruthenium, and(d) optionally 0 to 1 wt. % aluminum, 0 to 1 wt. % tantalum, 0 to 1 wt. % titanium and/or 0 to 5 wt. % silver.
    Type: Grant
    Filed: January 28, 1985
    Date of Patent: March 18, 1986
    Assignee: Degussa Aktiengesellschaft
    Inventors: Josef Rothaut, Jurgen Hausselt, Rudi Steinke, Angela Klaus