Patents by Inventor Donald Bernard Koepke

Donald Bernard Koepke 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).

  • Double touch key for musical instruments
    Patent number: 3935784
    Abstract: A double touch key for use with musical instruments and the like wherein a key lever is selectively supported on a plurality of pivots and is automatically transferred from one pivot to another as a function of the amount of depression of the key so as to provide a double touch action. A spring may be utilized to control the action of the key in each of the different pivotal modes. A difference in the feel of the key is automatically effected by the transfer of the pivot point.
    Type: Grant
    Filed: April 25, 1975
    Date of Patent: February 3, 1976
    Assignee: Warwick Electronics Inc.
    Inventor: Donald Bernard Koepke