Patents by Inventor Ping H. Lin

Ping H. Lin 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).

  • Multiple-stage screw for blending materials
    Patent number: 5573331
    Abstract: A multiple-stage extruder for mixing and extruding plastic. A central area of the screw includes a first blending area that has several obliquely positioned grooves. A second blending area includes a plurality of round protrusions. Both ends of the screw are supported in a main body to prevent vibration of the unit.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: November 12, 1996
    Inventor: Ping H. Lin