Patents by Inventor Robert W. Krawczyk

Robert W. Krawczyk 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).

  • Index rotary switch
    Patent number: 4891476
    Abstract: An index rotary switch including a rotary contact carrier journaled between a pair of thrust bearings solely for rotary motion. A rotary electrical contact including four contacts indexes with a stationary contact array forming an infinite number of ON-OFF positions and forms a redundant constant pressure electrical contact in each ON position.
    Type: Grant
    Filed: May 9, 1988
    Date of Patent: January 2, 1990
    Assignee: Illinois Tool Works, Inc.
    Inventors: Melvin S. Nation, Robert W. Krawczyk