Patents by Inventor Carroll D. Hobson

Carroll D. Hobson 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).

  • O-Ring and apparatus and method of manufacture
    Patent number: 4178003
    Abstract: In the manufacture of O-rings by compression molding, the mold parts are so shaped as to provide the O-ring with a flattened sealing surface along the outer and inner peripheral portions of the ring, with the mold parting line along one margin of each sealing surface. Optionally the ring may be provided with additional annular flattened sealing surfaces at the upper and lower peripheral portions of the ring body.
    Type: Grant
    Filed: March 11, 1977
    Date of Patent: December 11, 1979
    Assignee: Goshen Rubber Co., Inc.
    Inventor: Carroll D. Hobson
  • Positive pressure mold
    Patent number: 3951580
    Abstract: In accordance with the present invention a positive pressure mold is provided wherein the mold cavity is sealed during the initial movement of the dies. The entrapped air is caused to escape at a controlled rate as the dies move together, building up a sufficient air pressure between the dies to distribute the workpiece or "preform" throughout the die cavity.
    Type: Grant
    Filed: January 23, 1975
    Date of Patent: April 20, 1976
    Assignee: Goshen Rubber Co., Inc.
    Inventor: Carroll D. Hobson