Patents by Inventor John Charles Harden

John Charles Harden 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).

  • Pressure-sensitive elastic resistor compositions
    Patent number: 4028276
    Abstract: Pressure-sensitive compositions adaptable for use as elastic resistors over a wide pressure range, useful as keyboard switches or vehicle-crash sensors, comprising hard, metallic-conductive particles insulatively distributed in elastomer.
    Type: Grant
    Filed: March 27, 1975
    Date of Patent: June 7, 1977
    Assignee: E. I. Du Pont de Nemours & Company
    Inventors: John Charles Harden, Sebastian V. R. Mastrangelo