Patents by Inventor Hyun S. Chyu

Hyun S. Chyu 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 of extruding thermoplastic sheets
    Patent number: 4112166
    Abstract: The present invention relates to an improvement in a die for extruding thermoplastic sheet having a controlled degree of microsurface roughness. The improvement comprises having a beveled leading edge on at least one of the die lips wherein the bevel is away from the die orifice in order to control the degree of microsurface roughness in the extruded sheet.
    Type: Grant
    Filed: July 9, 1976
    Date of Patent: September 5, 1978
    Assignee: Monsanto Company
    Inventor: Hyun S. Chyu
  • Die for extruding thermoplastic sheets
    Patent number: 3994654
    Abstract: The present invention relates to an improvement in a die for extruding thermoplastic sheet having a controlled degree of microsurface roughness. The improvement comprises having a beveled leading edge on at least one of the die lips wherein the bevel is away from the die orifice in order to control the degree of microsurface roughness in the extruded sheet.
    Type: Grant
    Filed: January 2, 1975
    Date of Patent: November 30, 1976
    Assignee: Monsanto Company
    Inventor: Hyun S. Chyu