Patents by Inventor Porter Stone

Porter Stone 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).

  • Delayed actuator with visco-elastic timer
    Patent number: 4791251
    Abstract: A delayed actuator mechanism with visco-elastic timer is provided including a support section and an actuator section mounted to the support section. A compression spring biases the actuator section in a first state and permits the actuator section to be selectively switched to a second state. In that state a cocked torsion spring urges a detent carried by the actuator into engagement with a shoulder of the support section to restrain the actuator section in the second state. A visco-elastic delay mechanism gradually relaxes the torsion spring until the compression spring overcomes the detent shoulder restraint to abruptly switch the actuator section to the first state.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: December 13, 1988
    Assignee: Piezo Electric Products, Inc.
    Inventors: Robert E. Carter, Porter Stone