Patents by Inventor Susumu Tate

Susumu Tate 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).

  • Process for producing polyester fibers
    Patent number: 4917848
    Abstract: Process for producing polyester fibers of high tenacity and high modulus, by melt-spinning a polyester having an intrinsic viscosity of not lower than 0.3, to obtain extruded filaments of low orientation having a birefringence not higher than 10.0.times.10.sup.-3, post-polymerizing the filaments in a heating medium, and subjecting the filaments to multi-stage drawing in at least two stages.
    Type: Grant
    Filed: January 10, 1989
    Date of Patent: April 17, 1990
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Kazuo Kurita, Youichi Watanabe, Susumu Tate
  • Polyester fibers having high strength and high modulus and process for producing the same
    Patent number: 4851508
    Abstract: Polyester fibers having both a high strength and a high modulus prepared from ethylene terephthalate polyester, and having an intrinsic viscosity of not less than 1.0 and an initial tensile modulus is not less than 130 g/d, said intrinsic viscosity being determined in a mixed solvent of p-chlorophenol and tetrachloro ethane (3:1) at 30.degree. C. Processes for producing the fibers are also disclosed.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: July 25, 1989
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Kazuo Kurita, Masahiro Hayashi, Toshihiko Ohta, Hideaki Ishihara, Fujio Okada, Wataru Yoshikawa, Akira Chiba, Susumu Tate
  • Ultra-high-molecular-weight polyesters
    Patent number: 4742151
    Abstract: A novel ultra-high-molecular-weight polyester prepared from aromatic dicarboxylic acid or alkyl ester thereof and alkylene glycol, and having intrinsic viscosity of not less than 1.5 and insoluble polymer content of not more than 10% by weight.
    Type: Grant
    Filed: April 23, 1987
    Date of Patent: May 3, 1988
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Susumu Tate, Haruhiko Narusawa, Youichi Watanabe, Akira Chiba
  • Process for production of polyester
    Patent number: 4613664
    Abstract: A process for production of polyester which comprises steps of:subjecting aromatic dicarboxylic acid or alkyl ester thereof, and glycol to ester exchange reaction or esterification, andsubjecting the resulting mixture to polycondensation in a specific heating medium.The process can be carried out by using of small energy and a simple apparatus, and provides polyester having high quality.
    Type: Grant
    Filed: December 26, 1985
    Date of Patent: September 23, 1986
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Susumu Tate, Hiroshi Hashimoto, Akira Chiba