Patents by Inventor Kiyoshi Nakai

Kiyoshi Nakai 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).

  • Oligomer of m-isopropenylphenol
    Patent number: 4337367
    Abstract: An oligomer of m-isopropenylphenol is produced by subjecting m-isopropenylphenol to thermal polymerization in the absence of a catalyst.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: June 29, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Shuichi Kanagawa, Shinji Nakao, Kiyoshi Nakai, Kunimasa Kamio, Shunsuke Matsushima, Kazuhiko Hata, Kentaro Mashita
  • Pinch valve for a closed container
    Patent number: 4269333
    Abstract: A normally closed container containing liquid therein and having a single pinch valve secured thereto. The pinch valve releasably clamps a portion of a resilient liquid discharge tube and also releasably clamps a portion of a resilient inlet tube which introduces air into the container in discharging liquid out of the container. The timing of opening and closing of two tubes with respect to operation of the pinch valve is determined as desired.
    Type: Grant
    Filed: July 31, 1978
    Date of Patent: May 26, 1981
    Assignees: Asahi Malleablt Iron, Co., Ltd., Nippon Light Metal Co., Ltd.
    Inventors: Kiyoshi Nakai, Hidenobu Miyajima, Syuji Harada
  • Oligomerization of m-isopropenylphenol
    Patent number: 4260831
    Abstract: m-Isopropenylphenol oligomer which is useful for the production of synthetic resins such as epoxy resins is produced by polymerizing m-isopropenylphenol at a temperature of 135.degree. to 230.degree. C. using a catalytic amount of an acid catalyst in the presence or absence of a solvent, or freezing m-isopropenylphenol in the presence or absence of an acid catalyst.
    Type: Grant
    Filed: March 27, 1979
    Date of Patent: April 7, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Shunsuke Matsushima, Kazuhiko Hata, Kentaro Mashita, Shuichi Kanagawa, Shinji Nakao, Kiyoshi Nakai, Kunimasa Kamio
  • Epoxy resins and process for producing the same
    Patent number: 4211715
    Abstract: An epoxy resin of the formulae (I) and/or (II), ##STR1## wherein R and R' are each hydrogen atom or an alkyl group having 1 to 3 carbon atoms and n is a mean value satisfying the equation, 0<n.ltoreq.2, which is excellent in heat resistance, flexibility, curability and the like, and is useful in paints, adhesives, civil engineering and construction industry, electric appliances and the like.
    Type: Grant
    Filed: May 26, 1978
    Date of Patent: July 8, 1980
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Shuichi Kanagawa, Shinji Nakao, Kiyoshi Nakai, Kunimasa Kamio, Shunsuke Matsushima, Kazuhiko Hata, Kentaro Mashita