Patents by Inventor Masako Saijyo

Masako Saijyo 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).

  • Patent number: 6852856
    Abstract: A method of improving the stability of a quaternary ammonium salt and a method of efficiently preparing the quaternary ammonium salt having improved stability.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: February 8, 2005
    Assignee: Tokuyama Corporation
    Inventors: Naoki Hirano, Masako Saijyo
  • Publication number: 20040147740
    Abstract: A method of improving the stability of a quaternary ammonium salt and a method of efficiently preparing the quaternary ammonium salt having improved stability.
    Type: Application
    Filed: January 13, 2004
    Publication date: July 29, 2004
    Inventors: Naoki Hirano, Masako Saijyo
  • Publication number: 20030153785
    Abstract: A method of improving the stability of a quaternary ammonium salt and a method of efficiently preparing the quaternary ammonium salt having improved stability.
    Type: Application
    Filed: November 5, 2001
    Publication date: August 14, 2003
    Inventors: Naoki Hirano, Masako Saijyo
  • Patent number: 6458948
    Abstract: A method of preparing carboxylic acid derivatives comprising mixing a quaternary ammonium salt having a particular triazine ring in the molecules thereof, a carboxylic acid compound and a compound having a nucleophilic functional group, to condense the carboxylic acid with the compound having the nucleophilic functional group. The invention further provides a condensing agent comprising the quaternary ammonium salt. The condensation is conducted under mild conditions to form carboxylic acid derivatives and, particularly, amide compounds or ester compounds maintaining high yields.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: October 1, 2002
    Assignee: Tokuyama Corporation
    Inventors: Fumiaki Iwasaki, Shohei Tani, Munetaka Kunishima, Keiji Terao, Michiko Miharu, Naoki Hirano, Masako Saijyo