Patents by Inventor Keizo Sano

Keizo Sano 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).

  • Polyester fiber and method for the production thereof
    Patent number: 4526738
    Abstract: A polyester fiber having a tenacity of at least 4.0 g/d is formed from a copolyester having a degree of polymerization of from 80 to 100 of which copolyester 1.0 to 2.0 mol % of its acid component has a metal sulfoisophthalic group and 0.5 to 1.9 weight % of which copolyester is provided by a glycol component provided by glycol having a molecular weight of from 400 to 6000. The polyester fiber is readily dyed with basic dyes.The polyester fiber can be prepared by spinning the copolyester at a shear rate of.ltoreq.10.sup.4 sec.sup.-1, a spinning draft ratio of .ltoreq.250, a back pressure of the spinneret of.gtoreq.40 kg/cm.sup.2 and a shear stress of .ltoreq.(Q+0.7).times.10.sup.7 dyne/cm.sup.2, where Q is the mass output rate per single hole (g/min).
    Type: Grant
    Filed: July 8, 1983
    Date of Patent: July 2, 1985
    Assignee: Toray Industries, Inc.
    Inventors: Takehiko Miyoshi, Tadayuki Matsumoto, Keizo Sano
  • Fiber and film forming polyester composition
    Patent number: 4067855
    Abstract: Polyester compositions suitable for fiber and film formation contain from 0.2 to 3.0% by weight of fine particles of uniform size and possess sufficient slippery tendency, appropriate opacity and crystallizing potential; said particles containing lithium and phosphorus as a lithium salt of a phosphoric acid ester constituent of short chain polyesters.
    Type: Grant
    Filed: November 20, 1975
    Date of Patent: January 10, 1978
    Assignee: Toray Industries, Inc.
    Inventors: Tsuneyoshi Miwa, Shinji Nakazawa, Masaaki Itoga, Keizo Sano, Itaru Nakamura, Taigi Watanabe, Yasuhiko Shingu
  • Fiber- and film-forming polyester composition
    Patent number: 3951905
    Abstract: Fiber- and film-forming composition comprising a linear synthetic polyester together with antimony-containing particles, present in an amount of from 0.02 to 1.0% by weight of the composition. The content of elemental antimony in the antimony-containing particles is from 15 to 70% of the weight of the particles.
    Type: Grant
    Filed: April 30, 1974
    Date of Patent: April 20, 1976
    Assignee: Toray Industries, Inc.
    Inventors: Keizo Sano, Yoshimasa Nishida, Yoshio Kagiya, Michihiko Tanaka, Masatoshi Mineo
  • Polyester fiber and method for the production thereof
    Patent number: RE32741
    Abstract: A polyester fiber having a tenacity of at least 4.0 g/d is formed from a copolyester having a degree of polymerization of from 80 to 100 of which copolyester 1.0 to 2.0 mol % of its acid component has a metal sulfoisophthalic group and 0.5 to 1.9 weight % of which copolyester is provided by a glycol component provided by glycol having a molecular weight of from 400 to 6000. The polyester fiber is readily dyed with basic dyes.The polyester fiber can be prepared by spinning the copolyester at a shear rate of .ltoreq.10.sup.4 sec.sup.-1, a spinning draft ratio of .ltoreq.250, a back pressure of the spinneret of .gtoreq.40 kg/cm.sup.2 and a shear stress of .ltoreq.(Q+0.7).times.10.sup.7 dyne/cm.sup.2, where Q is the mass output rate per single hole (g/min).
    Type: Grant
    Filed: June 4, 1987
    Date of Patent: August 30, 1988
    Assignee: Toray Industries, Inc.
    Inventors: Takehiko Miyoshi, Tadayuki Matsumoto, Keizo Sano