Patents by Inventor Richard T. Johnstone

Richard T. Johnstone 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).

  • Patent number: 4025062
    Abstract: Apparatus for the rapid removal of burrs from workpieces by the application of transient thermal energy in a closed chamber. The chamber comprises a downwardly open upper closure fixedly supported above a vertically movable lower closure, both closures being water-cooled. Means are provided for alternately moving work supporting platens into position above the retracted lower closure. After being raised by a yieldable motor, the lower closure is drawn into sealing contact with the upper closure by a plurality of screws mounted around the upper closure and supporting a clamping ring. Pressure tightness is achieved by an uncompensated seal which does not require excessive clamping forces. Combustible gases are metered to the chamber and at the same time to charging cylinders, the gases in the charged cylinders then being forced into the chamber to obtain the maximum gas charge.
    Type: Grant
    Filed: March 8, 1976
    Date of Patent: May 24, 1977
    Assignee: Surftran Company
    Inventors: Richard T. Johnstone, Alfred C. Montag, Charles H. Franklin, Clarence S. Vinton