Patents by Inventor Jack E. Fisher

Jack E. Fisher 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).

  • Fail-safe actuator with two permanent magnets
    Patent number: 6040752
    Abstract: An electromagnetic actuator has two permanent magnets arranged along their polar axes, with the proximal poles having same polarity. An electromagnet surrounds the two permanent magnets and, when energized, overrides the repulsion between the proximal poles and moves one permanent magnet toward the other fixed magnet. Should the electromagnet fail, the actuator reverts to the unactuated position without need of a spring, gravity and so forth.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: March 21, 2000
    Inventor: Jack E. Fisher