Patents by Inventor Jurgen Schuhmacher

Jurgen Schuhmacher 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).

  • Publication number: 20110133682
    Abstract: For activating a stepper motor, a pulse-width modulated current is supplied to a coil of the stepper motor and it is determined whether the current flowing through the stepper motor, based on a default value, lies within a current bandwidth defined by an upper switching threshold and a lower switching threshold. The current supply to the coil is switched on when the detected current has dropped to the lower threshold and is switched off when the detected current has risen to the upper threshold. In order to detect a step loss, the signal form of the current or its change, respectively, is analyzed and deviations from desired values or desired value ranges, respectively, which have been caused by step losses, are detected. The determination of the signal form of the current or its change, respectively, may occur indirectly by analyzing a corresponding control signal.
    Type: Application
    Filed: December 3, 2008
    Publication date: June 9, 2011
    Inventors: Heinz Egger, Bernhard Heinz, Jurgen Schuhmacher
  • Patent number: 4900363
    Abstract: A process and liquid preparation is disclosed for removing residues from ers sawn from crystalline rods. In sawing rod-shaped workpieces such as semiconductor rods, for example, into wafers, by means of an internal-hole saw, auxiliary sawing materials such as for example cutting strips are often attached to the rods. According to the present invention, the residues of such auxiliary sawing materials remaining on the wafers obtained after the sawing operation can be removed particularly easily by means of immersion in baths of aqueous carboxylic solutions and, in particular, aqueous formic acid.
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: February 13, 1990
    Assignee: Wacker-Chemitronic Gesellschaft fur Elektronik-Grundstoffe m.b.H.
    Inventors: Gerhard Brehm, Manuela Knipf, Rudolf Mayrhuber, Jurgen Schuhmacher, Max Stadler