Patents by Inventor Tomoko Kamashita

Tomoko Kamashita 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).

  • Color-developing agents and color-developing sheets
    Patent number: 5647896
    Abstract: Provided are a color-developing agent comprising a multivalent metal salt of a salicylic acid derivative and a sulfonated phenol and/or a metal salt thereof and having excellent initial and ultimate color-developing capacities and improved waterproofness; and a color-developing sheet making use of the color-developing agent.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: July 15, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Takeshi Nishimura, Tomoko Kamashita, Masaru Wada, Teruyuki Nagata, Yoshimitsu Tanabe, Kiyoharu Hasegawa, Masakatsu Nakatsuka
  • Method for extracting an amino acid ester from a hydrous solution of a mineral acid salt thereof
    Patent number: 5374765
    Abstract: Disclosed is a method for extracting an amino acid ester from a hydrous solution which comprises adding thereto a water-insoluble organic solvent and then an amount of a base effective to liberate only a portion of the amino acid ester in free base form, and transferring the thus liberated amino acid ester in the free base form into the organic layer, and repeating the neutralization-extraction steps until all of the amino acid ester has been extracted.
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: December 20, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Tomoko Kamashita, Hiroyuki Yamashita, Teruyuki Nagata, Masanobu Ajioka