Patents by Inventor Shukichi Nabekawa

Shukichi Nabekawa 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 for producing o-alkoxybenzoic acid
    Patent number: 5344968
    Abstract: o-Methoxy benzoic acid is produced by reacting chlorobenzoic acids having at least one chlorine atom at least at the ortho position with lower alcohol in the presence of a copper salt and a lower alkyl as a catalyst under moderate reaction conditions. o-Methoxy benzoic acid is useful as an intermediate for pharmaceutical, agricultural chemicals, and the like.
    Type: Grant
    Filed: June 23, 1992
    Date of Patent: September 6, 1994
    Assignee: Nippon Chemical Industrial Co., Ltd.
    Inventors: Suchart Lilitkarntakul, Shukichi Nabekawa, Masao Takada, Katsuyuki Ogura
  • Manufacturing method for alkyldihalogenophosphines
    Patent number: 4857238
    Abstract: A manufacturing method for an alkyldihalogenophosphine uses an alkyl halide and a trihalide of phosphorus as starting materials. A reaction product which is formed by an FC reaction is reduced by yellow phosphorus in the presence of iodine, whereby an alkyldihalogenophosphine is manufactured. A high-purity alkyldihalogenophosphine can be manufactured with a high yield by using an excess amount of a trihalide of phosphorus, which can act as a reaction solvent.
    Type: Grant
    Filed: July 28, 1988
    Date of Patent: August 15, 1989
    Assignee: Nippon Chemical Industrial Co., Ltd.
    Inventors: Hiromu Tsuchiya, Shukichi Nabekawa, Masao Takada
  • Phosphoric acid dithioesters, and insecticides containing said dithioesters
    Patent number: 4694095
    Abstract: An organo phosphoric acid dithioester is produced by reacting either O-ethyl.S-normalpropyldithiophosphoric acid salt and substituted ethylmercaptoethyl halide or O-ethyl.S-normalpropylthiophosphoric acid halide and substituted ethylmercaptoethylmercaptans. Said organo phosphoric acid dithioester has excellent insecticidal activity against a wide variety of insects.
    Type: Grant
    Filed: August 8, 1986
    Date of Patent: September 15, 1987
    Assignees: Hironori Kushibiki, Nippon Chemical Industrial Co., Ltd.
    Inventors: Akinori Kariya, Shukichi Nabekawa, Yoshifusa Hara, Junji Taguchi