Patents by Inventor Theodore D. Graham

Theodore D. Graham 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).

  • Sprue bushing for injection molding machine
    Patent number: 4260348
    Abstract: A sprue bushing for an injection molding machine comprising a body surrounding a core. The core has a central passageway for flow of the plastic from the nozzle of the machine to the mold and has on its exterior surface longitudinal grooves. Assembly of the body and core forms fluid channels with the grooves. The temperature of the bushing is controlled by the flow of water through the channels.
    Type: Grant
    Filed: October 12, 1979
    Date of Patent: April 7, 1981
    Inventor: Theodore D. Graham