Patents by Inventor Ryoichi Tsurutani

Ryoichi Tsurutani 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 synthesizing optically active .beta.-halolactic acid
    Patent number: 5322782
    Abstract: Optically active .beta.-halolactic acids can be produced by contacting an .alpha.,.beta.-dihalopropionic acid with 2-halo acid dehalogenase. When the pH of the reaction system is above 9, this process gives optically active glycidic acid. Treatment of the optically active .beta.-halolactic acid thus obtained with an alkali also gives optically active glycidic acid.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: June 21, 1994
    Assignee: Unitika Ltd.
    Inventors: Hiroshi Nakajima, Masaaki Onda, Ryoichi Tsurutani, Kenzo Motosugi
  • Method for production of a growth factor for Bifidobacterium sp.
    Patent number: 5294546
    Abstract: A method of producing a growth promoting factor for Bifidobacterium species from lactose which comprises contacting lactose with resting cells of a lactose-utilizing yeast strain having activity to rearrange lactose to galacto-oligosaccharides.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: March 15, 1994
    Assignee: Unitika Ltd.
    Inventors: Munehiko Dombou, Isao Tomioka, Ryoichi Tsurutani, Senji Kitabatake, Hiroshi Nakajima
  • Method of preparing angiotensin converting enzyme inhibitors
    Patent number: 5243027
    Abstract: A method of preparing an angiotensin converting enzyme inhibitor having the amino acid sequence selected from the group consisting of:Gly-Lys-Glu-Ile-Ile-Val-Lys-Ala-Glu-Arg (SEQ ID No: 1),Gly-Lys-Met-Val-Lys-Val-Val-Ser-Trp-Tyr (SEQ ID No: 2) andAla-Tyr-Ile-Ala-Ser-Lys-Gly-Leu (SEQ ID No: 3); which comprises the steps of:(a) disrupting bacteria to obtain a cell extract, wherein the disruption is at least one of mechanical and chemical disruption;(b) exposing said cell extract to an acid mixture comprising acetic acid and hydrochloric acid, wherein said acid mixture comprises acetic acid in a concentration of 0.01 to 10M and hydrochloric acid in a concentration of 1 to 100 mM, to produce an acid hydrolysate; and(c) purifying from said acid hydrolysate a peptide having the amino acid sequence selected from the group consisting of:Gly-Lys-Glu-Ile-Ile-Val-Lys-Ala-Glu-Arg (SEQ ID No: 1),Gly-Lys-Met-Val-Lys-Val-Val-Ser-Trp-Tyr (SEQ ID No: 2) andAla-Tyr-Ile-Ala-Ser-Lys-Gly-Leu (SEQ ID No: 3).
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: September 7, 1993
    Assignee: Unitika, Ltd.
    Inventors: Tsutomu Mimura, Yasuhiro Kohama, Kazuhiko Nagata, Ryoichi Tsurutani
  • Slow-releasing composition of platinum-containing anticancer agent
    Patent number: 5204107
    Abstract: A slow-releasing composition of a platinum-containing anticancer agent comprising a platinum-containing anticancer agent bound to deacetylated chitin. The release of the platinum-containing anticancer agent is sustained for a prolonged duration of several months, thereby minimizing undesirable side effects of the platinum-containing anticancer agent.
    Type: Grant
    Filed: November 20, 1991
    Date of Patent: April 20, 1993
    Assignee: Unitika Ltd.
    Inventors: Ryoichi Tsurutani, Koji Kifune, Yuriko Nakamura
  • Angiotensin converting enzyme inhibitor
    Patent number: 5098887
    Abstract: An angiotensin converting enzyme inhibitor containing Gly-Lys-Glu-Ile-Ile-Val-Lys-Ala-Glu-Arg (SEQ ID No: 1) Gly-Lys-Met-Val-Lys-Val-Val-Ser-Trp-Tyr (SEQ ID No: 2) or Ala-Tyr-Ile-Ala-Ser-Lys-Gly-Leu (SEQ ID No: 3) as an active component.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: March 24, 1992
    Assignee: Unitika Ltd.
    Inventors: Tsutomu Mimura, Yasuhiro Kohama, Kazuhiko Nagata, Ryoichi Tsurutani
  • Melt-processable copolyamides having aromatic amide unit and fibers prepared therefrom
    Patent number: 4385170
    Abstract: A melt-processable copolyamide prepared from diamines and dicarboxylic acids by a melt-polymerization process, wherein said copolyamide contains from about 1 to 20 mol % of an aromatic amide unit having the formula ##STR1## wherein X and Y are aromatic units with extended bonds, such as 1,4-phenylene group. This copolyamide provides fiber with higher stiffness.
    Type: Grant
    Filed: May 29, 1981
    Date of Patent: May 24, 1983
    Assignee: Unitika Ltd.
    Inventors: Matsuo Hirami, Kazushige Kudo, Tsutomu Sugie, Toshihide Hibino, Ryoichi Tsurutani, Shigemitsu Murase
  • Method for manufacturing heat-stable polyesters using phosphonic acid compounds with cyclic carbonates and catalyst
    Patent number: 4374961
    Abstract: This invention is a method of manufacturing heat-stable polyesters, characterized in that phosphonic acid compounds are added, when heat-stable polyesters with decreased terminal carboxyl groups are manufactured by reacting polyesters and cyclic carbonate compounds in the presence of an alkali halide compound catalyst.
    Type: Grant
    Filed: May 29, 1981
    Date of Patent: February 22, 1983
    Assignee: Unitika Limited
    Inventors: Kazushige Kudo, Yoshihiro Arai, Ryoichi Tsurutani, Shun-ichi Kiriyama