Patents by Inventor Karl E. Weitzmann

Karl E. Weitzmann 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).

  • Commutating machine with integral speed control
    Patent number: 4025808
    Abstract: A motor or generator having a commutator and brushes for transfer of current to and from rotor windings has a stationary conducting sensor in sliding contact with the commutator, said sensor being narrower at its contact with the commutator than the insulation between the commutator bars where contacted by the sensor, so that a sensing circuit is interrupted between the sensor and one of the brushes at a frequency proportional to the speed of the rotor.
    Type: Grant
    Filed: July 21, 1975
    Date of Patent: May 24, 1977
    Assignee: Barber-Colman Company
    Inventors: Walter M. Grengg, Karl E. Weitzmann