Patents by Inventor Tak M. Cheung

Tak M. Cheung 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).

  • Patent number: 4981631
    Abstract: This invention relates to a process for making a lightweight article which involves the steps of: (1) feeding a thermoplastic resin composition into an extruder, wherein the thermoplastic resin composition contains (a) from about 94 to about 99 weight percent polyethylene terephthalate, and (b) from about 1 to about 6 weight percent of at least one polyolefin; (2) mixing an inert gas into the thermoplastic resin composition in the extruder while the thermoplastic resin composition is in the molten state; (3) extruding the thermoplastic resin composition containing the inert gas through a sheet forming die to produce a substantially amorphous cellular sheet which contains a sufficient amount of inert gas cells to provide the cellular sheet with a density which is within the range of about 0.4 to about 1.25; and (4) thermoforming the cellular sheet in a heated mold to produce the lightweight article. Dual-ovenable trays and other types of food containers can be made utilizing the process of this invention.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: January 1, 1991
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Tak M. Cheung, Charles L. Davis, Jack E. Prince
  • Patent number: 4201773
    Abstract: A series of compounds showing high antileukemic activity against P388 murine leukemia and increased aqueous solubility due to substitution of --OH for the known --NH.sub.2 at the 3' position of the hexopyranose sugar, i.e., daunosamine.These compounds are coupled products of aglycon selected from daunomycinone, desmethoxy daunomycinone, adriamycinone and carminomycinone. These compounds are coupled at the 0-7 position of the aglycon with an .alpha.
    Type: Grant
    Filed: July 26, 1978
    Date of Patent: May 6, 1980
    Assignee: The United States of America as represented by the Department of Health, Education and Welfare
    Inventors: Derek Horton, Wolfgang Weckerle, Ernst F. Fuchs, Tak M. Cheung, Beat Winter, Roderick J. Sorenson