Patents by Inventor Richard Tieu

Richard Tieu 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).

  • Super stretch draw die and method
    Patent number: 6006576
    Abstract: A die assembly for draw stamping sheet metal in a press. The die assembly has an upper die structure and a lower die structure, each constructed and arranged to me mounted on a press for reciprocal movement therebetween. The upper die structure and the lower die structure have complementary stamping surfaces for stamping sheet metal to a desired configuration. A clamping assembly and a stretching assembly grip the sheet metal along opposite sides of the complementary stamping surfaces and drivingly move apart in response to movement of the upper and lower die structures toward one another, thus pre-stretching the sheet metal as the upper and lower die structure are closed to stamp the sheet metal to a desired configuration.
    Type: Grant
    Filed: September 17, 1998
    Date of Patent: December 28, 1999
    Assignee: Cosma International Inc.
    Inventors: Erich Genseberger, Patrick Hickey, Tatsuo Umeda, Richard Tieu