Patents by Inventor David J. Czarnek

David J. Czarnek 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).

  • Switch actuator
    Patent number: 5192152
    Abstract: An automatic switch actuator is disclosed which may be used to test press-to-actuate type switches--for example, the key actuated switches of a computer keyboard. In the illustrated embodiment of the invention, a system of electrically operated valves are used to apply four different fluid pressures to selected pistons of an array of pneumatic cylinders. Each cylinder is mechanically connected to a plunger which is oriented so as to contact a selected key in an array of keys (i.e., a keyboard).
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: March 9, 1993
    Assignee: Compaq Computer Corporation
    Inventors: James T. Silvestri, Todd D. Podhaisky, Timothy E. Klein, Mark W. Baker, David J. Czarnek