Patents by Inventor David P. Weichmann

David P. Weichmann 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).

  • Motor circuit
    Patent number: 5798624
    Abstract: A motor control circuit for a d.c. commutator-type motor includes a semi-conductor driver circuit with a current sensor which provides an output voltage signal representing the instantaneous current in the motor. A detector circuit analyses the output signal of the sensor to provide pulses indicating the motor shaft position. The detector circuit includes a level-shifting, scaling and filtering circuit which substantially removes frequency components below a predetermined level and a pulse generator driven by the level shifting, scaling and filtering circuit.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: August 25, 1998
    Assignee: Lucas Industries
    Inventors: Robert A. Wilke, David P. Weichmann