Patents by Inventor Judson Mead

Judson Mead 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).

  • Seismic trigger
    Patent number: 4214238
    Abstract: An inverted, compound pendulum, which may be set in motion by a seismic variance, activates a photoelectric switching system. Logic circuitry in electrical contact with the switching system discriminates in a pre-determined manner with respect to the repetition rate of signals transmitted by the switching system and selectively activates and controls an alarm. Circuitry in the device permits display of the device's status and interacts with a self-contained power source to permit continued operation despite interruption of external power.
    Type: Grant
    Filed: March 8, 1977
    Date of Patent: July 22, 1980
    Assignee: Indiana University Foundation
    Inventors: William M. Adams, Robert F. Blakely, Charles R. Ellis, Judson Mead