Patents by Inventor Derek Salt

Derek Salt 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).

  • Temperature thermal history indicating device
    Patent number: 4829539
    Abstract: A temperature indicating device which comprises a plurality of panels in a fixed array. Some of the panels are adapted to undergo a reversible change in appearance at a given temperature whereas the remainder are adapted to undergo irreversible change in appearance at a given temperature. The device is useful in indicating the temperature which an object has achieved as well as its actual temperature.
    Type: Grant
    Filed: January 15, 1988
    Date of Patent: May 9, 1989
    Assignee: Rolls-Royce plc
    Inventors: James P. Angus, Derek Salt