Patents by Inventor Brian S. McElhinney

Brian S. McElhinney 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).

  • Keyboard scanner apparatus and method
    Patent number: 4906993
    Abstract: A digital keypad input device comprises a controller for driving a plurality of I/O signal lines selectively in input, output, and high impedance states. Each line operated in the output state presents an output logic signal that is detected, via a corresponding switch when closed, by another I/O line operated in the input state. Other lines are operated in the high impedance state. The method of the invention enables the number of manual switches to exceed the number of I/O lines.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: March 6, 1990
    Assignee: John Fluke Mfg. Co., Inc.
    Inventors: Mark S. Freeman, Brian S. McElhinney