Patents by Inventor Nagaaki Takamitsu

Nagaaki Takamitsu 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).

  • Process for preparing protocatechualdehyde and its derivatives
    Patent number: 4165341
    Abstract: A process for preparing protocatechualdehyde or a 3-alkoxy-4-hydroxybenzaldehyde which comprises subjecting catechol or a 2-alkoxyphenol to reaction with glyoxylic acid in a basic aqueous medium in the presence of a catalyst containing one or more compounds selected from aluminium oxide, silicon oxide and hydrated aluminium oxide in an amount of not less than 0.01 g per 1 g of the starting catechol or 2-alkoxyphenol at a temperature of 0.degree. to 50.degree. C., and then oxidizing the thus obtained reaction mixture in a basic medium.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: August 21, 1979
    Assignee: Ube Industries, Ltd.
    Inventors: Sumio Umemura, Nagaaki Takamitsu, Takuji Enomiya, Hiroshi Shiraishi, Takato Nakamura
  • Process for preparing dihydric phenol derivatives
    Patent number: 4078006
    Abstract: A process for preparing dihydric phenol derivatives by oxidizing monohydric phenol derivatives with hydrogen peroxide in the presence of a ketone. This reaction can be promoted in the presence of sulfuric acid or a salt thereof or a sulfonic acid or a salt thereof.
    Type: Grant
    Filed: April 30, 1976
    Date of Patent: March 7, 1978
    Assignee: UBE Industries, Ltd.
    Inventors: Sumio Umemura, Nagaaki Takamitsu, Toshikazu Hamamoto, Nobuyuki Kuroda
  • Process for preparing dihydric phenol derivatives
    Patent number: 4072722
    Abstract: A process for preparing dihydric phenol derivatives by oxidizing monohydric phenol derivatives with a ketone peroxide in the presence or absence of sulfuric acid or a salt thereof or a sulfonic acid or a salt thereof.
    Type: Grant
    Filed: November 29, 1976
    Date of Patent: February 7, 1978
    Assignee: UBE Industries, Ltd.
    Inventors: Sumio Umemura, Nagaaki Takamitsu, Toshikazu Hamamoto, Nobuyuki Kuroda
  • Process for preparing hydroxyphenyl ethers
    Patent number: 4013727
    Abstract: A process for preparing hydroxyphenyl ethers by oxidizing phenyl ethers with hydrogen peroxide in the presence of a ketone or with a ketone peroxide.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: March 22, 1977
    Assignee: UBE Industries, Ltd.
    Inventors: Sumio Umemura, Nagaaki Takamitsu, Toshikazu Hamamoto, Nobuyuki Kuroda