Patents by Inventor Misao Uohama

Misao Uohama 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 producing dihydric phenols
    Patent number: 5138104
    Abstract: A process for producing dihydric phenols is disclosed. The process comprises reacting a phenol with a ketone peroxide or a combination of a ketone and hydrogen peroxide in the presence of a compound having at least one P-S bond. Dihydric phenols can be produced in high yield without requiring neutralization after the reaction.
    Type: Grant
    Filed: July 25, 1991
    Date of Patent: August 11, 1992
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Katsuji Takahashi, Misao Uohama, Takayuki Akiyama
  • Process for producing aminooxyacetic acid salts
    Patent number: 4948916
    Abstract: A process for producing an aminooxyacetic acid salt comprises reacting benzhydroxamic acid of formula: ##STR1## (where R.sup.1 is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom) with a halogenoacetic acid of formula:XCH.sub.2 CO.sub.2 H (III)(where X is an iodine, bromine or chlorine atom) in the presence of a metal hydroxide or a metal carbonate to form benzamidooxyacetic acid of formula (IV): ##STR2## and thereafter hydrolyzing the benzamidooxyacetic acid in the presence of a mineral acid to obtain an aminooxyacetic acid salt of formula:2H.sub.2 NOCH.sub.2 CO.sub.2 H.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: August 14, 1990
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Misao Uohama, Youichirou Tani