Patents Assigned to Pravel & Wilson
  • Generator frequency converter
    Patent number: 3967185
    Abstract: A frequency converter for use with a generator, particularly a gasoline engine driven generator, to provide electrical power at a suitable frequency through a power switching circuit with a timing control circuit to protect the power switching circuit.
    Type: Grant
    Filed: April 29, 1974
    Date of Patent: June 29, 1976
    Assignee: Pravel & Wilson
    Inventor: William E. Brooks
  • Tongue toothbrush
    Patent number: 3959842
    Abstract: A tongue toothbrush adapted to be mounted with the tongue both for loosening particulate matter entrapped between the teeth and for cleansing the teeth.
    Type: Grant
    Filed: April 18, 1975
    Date of Patent: June 1, 1976
    Assignees: Pravel & Wilson, David W. Alley
    Inventor: David W. Alley