Patents by Inventor Trefor T. Jones

Trefor T. Jones 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).

  • Method and apparatus for injection molding including valve stem positioning
    Patent number: 6228309
    Abstract: Improved method and apparatus for injection molding particularly useful with multiple hot runner valve gates to fill a single large mold cavity. A hot runner injection nozzle is provided having a gate through which melt is injected into a mold cavity, and a valve stem is movable on the injection nozzle between an open position permitting flow of melt through the gate and a closed position blocking the flow of melt through the gate. The valve stem is movable to at least one position between the open and closed positions restricting the flow of melt through the valve gate.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: May 8, 2001
    Assignee: Husky Injection Molding Systems Ltd.
    Inventors: Trefor T. Jones, Jacek Kalemba, Robert D Schad, Stefan Von Buren