Patents by Inventor Peter W. Hurst, deceased

Peter W. Hurst, deceased 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 visible and invisible states
    Patent number: 5544020
    Abstract: A chart recorder or other instrument has a window 10 within which is a key panel 1 composed of materials which are transparent in normal conditions. Incorporated in or associated with the individual elements of the key panel are display elements 22 applied to the transparent window material 20. The display elements are normally transparent but become visible, for example by fluorescence, when illuminated by radiation transmitted through the body of the transparent window material 20, rendering the key panel visible when needed for use.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: August 6, 1996
    Assignee: Eurotherm Recorders Limited
    Inventors: Peter J. Loeber, Peter W. Hurst, deceased, George R. Hurst, legal representative