Patents by Inventor Toshihiko Yahata

Toshihiko Yahata 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).

  • ALIPHATIC TRIISOCYANATE COMPOUND, PROCESS FOR PRODUCING THE SAME, AND POLYURETHANE RESIN MADE FROM THE COMPOUND
    Publication number: 20020123644
    Abstract: 3-isocyanate methyl-1,6-hexamethylene diisocyanate which is useful for the production of polyurethane resins such as polyurethane polyisocyanate; a process for producing 3-isocyanate methyl-1,6-hexamethylene diisocyanate which process comprises reacting 3-aminomethyl-1,6-hexamethylene diamine with phosgene in the presence of a tertiary amine; and a paint or an adhesive containing the polyurethane resin produced using the above isocyanate compound.
    Type: Application
    Filed: October 12, 1999
    Publication date: September 5, 2002
    Inventors: MITSUMASA KITAI, HIROTAKA RYUUTOU, TOSHIHIKO YAHATA, YOSHINORI HARA, HIROSHI IWANE, YUUJI SOEJIMA
  • Method for purifying homocystine
    Patent number: 6077971
    Abstract: Disclosed is a method for purifying homocystine comprising treating crude homocystine with a base, a method for purifying homocystine comprising recovering homocystine by neutralizing an alkaline aqueous solution of crude homocystine with an acid, and a homocystine powder containing 1,000 ppm or less of a polysulfide.
    Type: Grant
    Filed: December 3, 1998
    Date of Patent: June 20, 2000
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Jun Takehara, Shuji Ichikawa, Hiroshi Iwane, Hirotaka Ryutou, Kenichi Sugimoto, Toshihiko Yahata