Patents by Inventor Richard D. Spencer

Richard D. Spencer 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).

  • Thermal battery
    Patent number: 6475662
    Abstract: An improved thermal battery with improved operating efficiency. The thermal battery utilizes both a first activatible heat source and a second independently activatible heat source. The second heat source is optionally activated under storage environment conditions, such as low temperature, which thereby allow battery operation of improved efficiency.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: November 5, 2002
    Assignee: Eagle-Picher Technologies, LLC
    Inventor: Richard D. Spencer