Patents by Inventor Mark D. Palmer

Mark D. Palmer 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).

  • Double action spring actuator
    Patent number: 4811564
    Abstract: Electrically operated linear actuators are provided wherein both the forward and rearward motions are obtained by heating a shape memory metal to its austenitic state and thereafter cooling it to its martensitic state. One shape memory metal forms a retractor spring while the other shape memory metal forms an expansion spring.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: March 14, 1989
    Inventor: Mark D. Palmer