Patents by Inventor Guenter Tiefel

Guenter Tiefel 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: 4565590
    Abstract: The invention relates to a material for electrical contacts, in particular for contact studs in low-voltage switchgear. The material consists of silver, tin oxide and other additives. A material is sought where the overtemperature is lowered as compared with known AgSnO.sub.2 material. According to the invention, the further additives are in combination oxides of the metals tantalum (Ta.sub.2 O.sub.5), copper (CuO) and bismuth (Bi.sub.2 O.sub.3). Further the material may contain also tungsten or oxygen containing tungsten compounds. Preferably the material contains 5 to 20 mass % SnO.sub.2, 0.1 to 5 mass % Ta.sub.2 O.sub.5 5 mass % CuO, 0.1 to 5 mass % Bi.sub.2 O.sub.3, optionally 0.05 to 3 mass % tungsten and silver as balance. In the method for producing contact studs, the powder metallurgical production of the material is followed by extrusion to a ribbon, from which contact studs can be separated which have an edge-parallel directional structure.
    Type: Grant
    Filed: January 23, 1985
    Date of Patent: January 21, 1986
    Assignee: Siemens Aktiengesellschaft
    Inventors: Joachim Grosse, Guenter Tiefel, Wolfgang Haufe