Patents by Inventor Masayoshi Gohbayashi

Masayoshi Gohbayashi 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 the production of ester compounds
    Patent number: 5081280
    Abstract: In producing ester compound useful as an antioxidant for organic materials which are represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 are the same or different and represent hydrogen or straight or branched chain alkyl radicals containing 1-8 carbon atoms, Z is an organic radical derived from an n-hydroxy alcohol, and n denotes an integer of 1 to 4, by transesterification, monoalkyltin compounds are used as a catalyst, whereby the ester compounds can be produced with high quality and in high yields.
    Type: Grant
    Filed: March 7, 1989
    Date of Patent: January 14, 1992
    Assignee: Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Koichi Takee, Masayoshi Gohbayashi, Kunihide Oka
  • N-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate with a novel crystalline form
    Patent number: 4950780
    Abstract: Novel crystalline form of n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate with improved transportability, measurability and workability is disclosed.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: August 21, 1990
    Assignee: Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Masaya Tanaka, Masayoshi Gohbayashi, Kunihide Oka
  • Method of producing tetrakis[3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane
    Patent number: 4885382
    Abstract: A method for producing tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane by ester exchange between a 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester and pentaerythritol in the presence of a basic catalyst, which comprises carrying out the reaction in the presence of a 3-(3-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester.According to the method of the invention, tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane can be obtained in high yields as fine granules having good properties without coloration, with certainty and good reproducibility.
    Type: Grant
    Filed: September 28, 1988
    Date of Patent: December 5, 1989
    Assignee: Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Masayoshi Gohbayashi, Noritsugu Narita, Makoto Maruno
  • Method of producing tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane
    Patent number: 4883902
    Abstract: A method of producing tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane by ester exchange between a 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester and pentaerythritol in the presence of a basic catalyst, which comprises carrying out the reaction in the presence of bis[2,2,2-tris(hydroxymethyl)ethoxylmethane.According to the method of the invention, tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane can be obtained in high yields and in high purity without using an excessively large amount of a 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid alkyl ester which is an expensive compound, while controlling the formation of the byproduct to a minimum level.
    Type: Grant
    Filed: September 28, 1988
    Date of Patent: November 28, 1989
    Assignee: Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Masayoshi Gohbayashi, Noritsugu Narita, Makoto Maruno