Patents by Inventor Sachiko Miyagi

Sachiko Miyagi 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).

  • Partially protected novel trisphenols and process for production thereof
    Patent number: 6603029
    Abstract: The invention provides a partially protected trisphenol having the general formula (I) wherein R1 is an alkyl group of 1-4 carbons or an alkoxyl group of 1-4 carbons, R2 is an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbons, X1 is a hydrogen atom, an alkoxycarbonylmethyl group wherein the alkyl group has 1-4 carbons, an alkoxycarbonyl group wherein the alkyl group has 1-4 carbons or a tetrahydropyranyl group, X2 is a hydrogen atom, an alkoxycarbonylmethyl group wherein the alkyl group has 1-4 carbons, an alkoxycarbonyl group wherein the alkyl group has 1-4 carbons or a tetrahydropyranyl group, provided that when X1 is a hydrogen atom, X2 is not a hydrogen atom, and when X2 is a hydrogen atom, X1 is not a hydrogen atom; and m is an integer of 0, 1 or 2, and n is an integer of 0, 1, 2 or 3.
    Type: Grant
    Filed: December 18, 2000
    Date of Patent: August 5, 2003
    Assignee: Honshu Chemical Industry Co., Ltd.
    Inventors: Taiichi Shiomi, Sachiko Miyagi, Toru Masuda
  • Method for producing carboxylic acid tertiary alkyl ester
    Patent number: 6492542
    Abstract: A carboxylic acid tertiary alkyl ester (Chemical formula 1) of high purity is obtained at a high yield ratio, by continually adding an esterification agent possessing a monovalent acid group, which agent is ester-interchangeable with a tertiary alcohol, to a mixed fluid of a carboxylic acid and a tertiary alcohol: R1(COOR2)n.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: December 10, 2002
    Assignee: Honshu Chemical Industry Co., Ltd.
    Inventors: Sachiko Miyagi, Masayuki Maeda, Seiji Kawano, Taiichi Shiomi
  • Method for producing carboxylic acid tertiary alkyl ester
    Publication number: 20020055649
    Abstract: A carboxylic acid tertiary alkyl ester (Chemical formula 1) of high purity is obtained at a high yield ratio, by continually adding an esterification agent possessing a monovalent acid group, which agent is ester-interchangeable with a tertiary alcohol, to a mixed fluid of a carboxylic acid and a tertiary alcohol:
    Type: Application
    Filed: August 21, 2001
    Publication date: May 9, 2002
    Inventors: Sachiko Miyagi, Masayuki Maeda, Seiji Kawano, Taiichi Shiomi