Patents by Inventor John Langkau

John Langkau 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).

  • Electrochemical cell with internal circuit interrupter
    Patent number: 4855195
    Abstract: Electrochemical cells employ a current collector-safety switch member comprised of a shape memory alloy in the electric circuit in the cell. The collector-safety switch member has a base portion and a plurality of legs extended therefrom and when the internal temperature of the cell rises, the legs of the collector-safety switch member are retracted to thereby disconnect the electrical circuit in the cell. These cells can also be comprised of a resettable thermal switch for inhibiting the flow of current in the cell at a temperature below the disconnect temperature of the current collector-safety switch member.
    Type: Grant
    Filed: July 11, 1988
    Date of Patent: August 8, 1989
    Assignee: Eveready Battery Company, Inc.
    Inventors: Philip Georgopoulos, John Langkau