Patents by Inventor Ming-Ya Tang

Ming-Ya Tang 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).

  • Solution spinning process for producing a polyethylene terephthalate filament
    Patent number: 5061425
    Abstract: A process for producing a high modulus, high tenacity polyethylene terephthalate filament which comprises (1) spinning a solution of polyethylene terephthalate in an organic solvent through a die to produce a solution spun filament, wherein the polyethylene terephthalate has an intrinsic viscosity of at least about 1.0 dl/g and wherein the organic solvent is selected from the group consisting of (a) hexafluoroisopropanol, (b) trifluoroacetic acid, (c) mixed solvent systems containing from about 20 weight percent to about 99 weight percent hexafluoroisopropanol and from about 1 weight percent to about 80 weight percent dichloromethane, and (d) mixed solvent systems containing from about 20 weight percent to about 99 weight percent trifluoroacetic acid and from about 1 to about 80 weight percent dichloromethane; and (2) subsequently drawing the solution spun filament to a total draw ratio of at least about 7:1 to product the high modulus, high tenacity polyethylene terephthalate filament.
    Type: Grant
    Filed: September 7, 1989
    Date of Patent: October 29, 1991
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Masayoshi Ito, Ming-Ya Tang, Soojaa L. Kim
  • Solution spinning process
    Patent number: 4968471
    Abstract: This invention discloses a process for producing a high modulus, high tenacity polyethylene terephthalate filament which comprises (1) spinning a solution of polyethylene terephthalate in an organic solvent through a die to produce a solution spun filament, wherein the polyethylene terephthalate has an intrinsic viscosity of at least about 3.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: November 6, 1990
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Masayoshi Ito, Ming-Ya Tang, Soojaa L. Kim