Patents by Inventor John Shao-Tze Hsu

John Shao-Tze Hsu 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).

  • Parison extrusion head
    Patent number: 4097214
    Abstract: This is an extrusion head for extruding a parison to be blow molded. A shooting mandrel is longitudinally movable within a plastic melt accumulator chamber. After a "shot", the shooting mandrel is in the up position. The plastic melt fed to the plastic accumulating chamber forces the shooting mandrel to the down position as the plastic accumulating chamber is filled. The parison is formed by moving the shooting mandrel upwardly to the up position. The plastic flows around the shooting mandrel as it flows from the accumulating chamber and out of the extrusion head.
    Type: Grant
    Filed: December 8, 1976
    Date of Patent: June 27, 1978
    Assignee: Ingersoll-Rand Company
    Inventor: John Shao-Tze Hsu