Patents by Inventor Hajime Hirai

Hajime Hirai 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).

  • Racemization of optically active 2-(4-chlorophenyl)-3-methylbutyric acid
    Patent number: 4245116
    Abstract: A method for racemization of optically active 2-(4-chlorophenyl)-3-methylbutyric acid which comprises the steps of (a) reacting optically active 2-(4-chlorophenyl)-3-methylbutyric acid with a hydroxide or carbonate of an alkali metal or alkaline earth metal at a temperature of more than 110.degree. C. to produce a racemate of the alkali metal or alkaline earth metal salt of the above acid, and (b) converting the resulting racemate of the salt to the acid.
    Type: Grant
    Filed: December 11, 1978
    Date of Patent: January 13, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Nobuo Ohno, Masakazu Miyakado, Hajime Hirai
  • Purification process for 3-phenoxybenzaldehyde
    Patent number: 4162269
    Abstract: A purification process for 3-phenoxybenzaldehyde, which comprises reacting crude 3-phenoxybenzaldehyde with an alkali metal or ammonium bisulfite, or metabisulfite in the presence of an organic quaternary ammonium salt, an inorganic acid salt of organic tertiary amines, or a macrocyclic polyether used as a catalyst, isolating the resulting 3-phenoxybenzaldehyde alkali metal or ammonium bisulfite adduct, and decomposing it by using an acid or a base, or by heating.
    Type: Grant
    Filed: August 16, 1977
    Date of Patent: July 24, 1979
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Masato Mizutani, Akio Higo, Nobuo Ohno, Hajime Hirai
  • Preparation of optically active allethrorone via allethronyl acid phthalate
    Patent number: 3947519
    Abstract: The present invention relates to a process for preparing allethrolone which involves hydrolyzing 2-allyl-4-hydroxy-3-methyl-2-cyclopentenone acid phthalate represented by the formula ##SPC1##In water or an aqueous solvent with or without a base of less than a small excess of the equivalent.
    Type: Grant
    Filed: March 28, 1974
    Date of Patent: March 30, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Masanao Matsui, Fukashi Horiuchi, Hajime Hirai, Nobushige Itaya