Patents by Inventor Karl L. Kilian

Karl L. Kilian 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 having keys with different heights
    Patent number: 5274217
    Abstract: A keyboard has keys arranged in parallel columns with all of the keys in a respective column projecting from a front plate the same distance. The keys of a first column are arranged to project a smaller distance from the front plate than the keys of an adjacent second column.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: December 28, 1993
    Assignee: Fritz Hartmann Geratebau GmbH & Co. KG
    Inventor: Karl L. Kilian