Patents by Inventor Christopher M. Schwab

Christopher M. Schwab 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).

  • Dynamic brake circuit for motor
    Patent number: 4144482
    Abstract: A brake circuit for a universal motor having an armature and a field winding normally connected in series therewith, the circuit including switch means operable to disconnect the power source and electrically connect the armature in series with the field winding and a brake resistor, with voltage limiting means in parallel with the field winding. The voltage limiting means include biasing diodes for maintaining the voltage across the field generally constant, resulting in a more even deceleration rate and a lower total brake time.
    Type: Grant
    Filed: April 7, 1977
    Date of Patent: March 13, 1979
    Assignee: Beckman Instruments, Inc.
    Inventor: Christopher M. Schwab