Patents by Inventor C. Thomas Hardwick

C. Thomas Hardwick 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).

  • Piston positioning indicator
    Patent number: 4140045
    Abstract: In a piston actuated valve, means for determining the position of the operating piston by means of at least one insulated contact probe which is inserted through the wall of the cylinder. Two or more can be used, one in each extreme position of the piston. As the piston moves into its extreme position, contact is made with the probe and a suitable signal is sent, indicating that the piston is in that extreme position.
    Type: Grant
    Filed: February 16, 1977
    Date of Patent: February 20, 1979
    Assignee: Fenix & Scisson, Inc.
    Inventors: C. Thomas Hardwick, Steven R. Webb