Patents by Inventor Tetsuya Asahi

Tetsuya Asahi 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).

  • Poly(arylene thioether) copolymers and process for producing thereof
    Patent number: 5115091
    Abstract: A novel class of poly(arylene thioether) copolymers which are not only thermoplastic but thermosetting in nature. The copolymer may be prepared by copolymerizing a combination of dihalogenobenzonitrile, dihalogenobenzophenone and thioetherifying agent in a organic solvent.The copolymers are highly resistant to heat and solvents and exhibit excellent mechanical properties at raised temperatures.
    Type: Grant
    Filed: July 7, 1989
    Date of Patent: May 19, 1992
    Assignee: Tosoh Corporation
    Inventors: Tomoji Tamai, Tetsuya Asahi, Yozo Kondo
  • Poly(arylene cyano-thioether) copolymer and preparation thereof
    Patent number: 4980454
    Abstract: Reaction of a dihalogenobenzonitrile and a dihalogenobenzene with a thioetherifying agent provides a poly(arylene thioether) copolymer which is both thermoplastic and thermosetting in nature. Utilization of these dual properties results in products of improved physical properties.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: December 25, 1990
    Assignee: Tosoh Corporation
    Inventors: Tomoji Tamai, Tetsuya Asahi, Yozo Kondo
  • Poly(cyano arylene sulfide/sulfone)copolymer and preparation thereof
    Patent number: 4973663
    Abstract: A novel thermoplastic poly(arylene thioether) copolymer which may be cross-linked is provided. The copolymer may be prepared by reacting a dihalogenobenzonitrile, a dihalogenophenyl sulfone and a thioetherifying agent in a suitable organic solvent.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: November 27, 1990
    Assignee: Tosoh Corporation
    Inventors: Tomoji Tamai, Tetsuya Asahi, Yozo Kondo
  • Polycyanoaryl thioether and preparation thereof
    Patent number: 4894434
    Abstract: A highly heat resistant polymer, polycyanoaryl thioether, of formula: ##STR1## where n is a number of not less than 3 is disclosed. A process for preparing the novel polymer is also disclosed.
    Type: Grant
    Filed: May 19, 1988
    Date of Patent: January 16, 1990
    Assignee: Tosoh Corporation
    Inventors: Tetsuya Asahi, Yozo Kondo
  • Method of polymerizing vinyl monomers with coated reactor
    Patent number: 4680349
    Abstract: A method of preventing the scale from sticking wherein, upon the polymerization of vinyl type monomers in aqueous medium, reaction products of liquid polybutadiene with phenolic compounds or reaction products between thermoplastic resin gathered from the stumps of pine, phenolic compounds and, if desired, aldehyde compounds are coated beforehand onto the inside face of polymerization vessel, and a preventive agent of scale from sticking are disclosed.
    Type: Grant
    Filed: January 2, 1986
    Date of Patent: July 14, 1987
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Tetsuya Asahi, Hiroshi Kaneko, Yasushi Sakai, Akio Kiyohara, Tooru Iwashita
  • Substitute blood vessel and a process for preparing the same
    Patent number: 4098571
    Abstract: A process for preparing a heterograft substitute blood vessel comprises digesting a properly pretreated pig blood vessel with a digesting solution containing an animal proteolytic enzyme so as to retain collagenous and elastic fiber constituents substantially in the original state and substantially remove away other tissue constituents of said blood vessel than said two kinds of constituents, and then fixing the resulting digested blood vessel into a desired shape with a liquid fixing agent.
    Type: Grant
    Filed: August 4, 1976
    Date of Patent: July 4, 1978
    Assignees: Kaneyasu Miyata, Izumi Amano, Kohei Toda
    Inventors: Kaneyasu Miyata, Izumi Amano, Takehiko Iwai, Tetsuya Asahi