Patents by Inventor Tadao Itikawa

Tadao Itikawa 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).

  • Producing sequential polyamino acid resin
    Patent number: 4594409
    Abstract: A sequential polyamino acid resin having a remarkably high molecular weight and special amino acid sequence as repeating unit in the resin can be produced by conducting polycondensation of a peptide active ester acid salt in an aprotic polar solvent in the presence of a tertiary amine and phosphorus pentoxide.
    Type: Grant
    Filed: August 30, 1984
    Date of Patent: June 10, 1986
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Ikuo Hayashi, Tadao Itikawa, Kiyoshi Shimizu
  • Process for acylation with novel acylating agent
    Patent number: 4559172
    Abstract: This invention relates to a novel acylation process which comprises using as the acylating agent an o-hydroxy-substituted aromatic oxime ester represented by the general formula (I) ##STR1## and mixing said acylating agent with an amine substance represented by the general formula (III) ##STR2## to form a compound represented by the general formula (IV) ##STR3##
    Type: Grant
    Filed: May 1, 1984
    Date of Patent: December 17, 1985
    Assignee: Nitto Boseki
    Inventors: Ikuo Hayashi, Keizo Ogihara, Tadao Itikawa, Kiyoshi Shimizu
  • Process for producing sequential polyamino acid resin
    Patent number: 4525576
    Abstract: A sequential polyamino acid resin having a remarkably high molecular weight and special amino acid sequence as repeating unit in the resin can be produced by conducting polycondensation of a dipeptide active ester acid salt in an aprotic polar solvent in the presence of a tertiary amine and phosphorus pentoxide.
    Type: Grant
    Filed: October 15, 1984
    Date of Patent: June 25, 1985
    Assignee: Nitto Boseki Co. Ltd.
    Inventors: Ikuo Hayashi, Tadao Itikawa, Keizo Ogihara, Kiyoshi Shimizu