Patents by Inventor Andreas Hofmann

Andreas Hofmann 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: 6229490
    Abstract: In an antenna coupler (100) for testing mobile telephones (10), simple structure, which has a low coupling attenuation, is provided in that the antenna coupler (100) has the following features: a printed circuit board (1), on the upper side of which there is formed by a strip transmission line technique at least one antenna element (7,8); and a receiving element for a mobile telephone (10) secured to the upper side of the printed circuit board (1).
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: May 8, 2001
    Assignee: Wavetek GmbH
    Inventor: Andreas Hofmann
  • Patent number: 5243788
    Abstract: In a method and an apparatus for balancing a grinding wheel, balancing weights on the grinding wheel remain secured to the grinding wheel in an unbalance measuring operation, and the positions at which the balancing weights are secured to the grinding wheel are stored. In a repositioning operation for compensating for measured unbalance of the grinding wheel, the influences of the forces of the balancing weights during the unbalance measuring operation are derived from the stored positions of the weights and compensated for so as to balance the ginding wheel.
    Type: Grant
    Filed: August 15, 1990
    Date of Patent: September 14, 1993
    Assignee: Gebr. Hofmann GmbH & Co., KG Maschinenfabrik
    Inventors: Gunther Rossmann, Jesus Varona, Andreas Hofmann
  • Patent number: 5075178
    Abstract: The invention relates to a cyanide-free electrolyte being harmless to the environment and to health which makes feasible the production of black surface layers on light metals or on alloys of the latter, preferably titanium, remaining deeply-black and adhesive even after extreme changes in the ambient temperature and having nearly equal values of the optical absorptivity of radiation and of the thermal emission capability (the .alpha./.epsilon.-ratio is about 0.95) by means of the anodic oxidation by spark discharge (ANDF-method). These layers are absolutely X-amorphous and show, hence, an ideal optically isotropic behavior regarding the reflection of radiation. Due to their minmum evolution of gases they offer a high thermovacuum stability. The electrolyte consists of an ammoniacal solution of K.sub.2 H.sub.2 PO.sub.4 potassium dihydrogenphosphate and K.sub.2 CrO.sub.4 potassium chromate. The homogeneity of the optically black layers is ensured by not using fluoride ions and employing acetate ions.
    Type: Grant
    Filed: January 7, 1990
    Date of Patent: December 24, 1991
    Assignee: Jenoptik Jena GmbH
    Inventors: Juergen Schmidt, Thomas Furche, Roland Erdmann, Marion Reichert, Bayer Ullrich, Peter Kurze, Thomas Schwarz, Joachim Schreckenbach, Hans-Juergen Kletke, Andreas Hofmann, Martin Heppner, Anja Hasse, Dorith Schmidt, Annette Klaus
  • Patent number: D325854
    Type: Grant
    Filed: September 21, 1989
    Date of Patent: May 5, 1992
    Assignee: F. Vaihinger GmbH & Co. Kommanditgesellschaft
    Inventor: Andreas Hofmann