Patents by Inventor Hirokazu Morisawa

Hirokazu Morisawa 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).

  • Compounds for the cleavage at a specific position of RNA, oligomers employed for the formation of said compounds, and starting materials for the synthesis of said oligomers
    Patent number: 5013830
    Abstract: There is disclosed a compound having a double chain which is composed of an RNA (+chain) and a complementary DNA (-chain), wherein a portion of the DNA (-chain) has been replaced by an RNA or a derivative thereof, and wherein, when the compound is subjected to the action of an enzyme having a ribonuclease H activity, it is possible to preferentially cleave the RNA (+chain) in a position corresponding to the unsubstituted portion of the DNA (-chain). The compound can thus be used for the preferential cleavage of a phosphodiester bond in a specific position of RNA. Accordingly, the invention provides a useful means for preparing, for instance, a deletion mutant. There is also disclosed a mixed oligomer which comprises an oligomer of RNA or a derivative thereof and a DNA oligomer, wherein the RNA oligomer or a derivative thereof is conjugated to the DNA oligomer via a phosphate diester linkage between the 5'-hydroxyl group and the 3'-hydroxyl group in the ribose or deoxyribose moiety.
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: May 7, 1991
    Assignee: Ajinomoto Co., Inc.
    Inventors: Eiko Ohtsuka, Hideo Inoue, Hirokazu Morisawa, Susumu Shibahara, Sachiko Mukai, Tohru Nishihara
  • Method for producing purine arabinosides
    Patent number: 4371613
    Abstract: Purine-arabinosides and a method for making purine-arabinosides are disclosed. The method comprises contacting an arabinose donor and a purine source in the presence of an effective amount of enzyme produced by a bacterium and capable of transarabinosylation from the arabinose donor to the purine source, whereby a 9-(.beta.-D-arabinofuranosyl)-purine is produced.
    Type: Grant
    Filed: August 1, 1978
    Date of Patent: February 1, 1983
    Assignee: Ajinomoto Company Incorporated
    Inventors: Takashi Utagawa, Takeshi Miyoshi, Hirokazu Morisawa, Akihiro Yamazaki, Fumihiro Yoshinaga, Koji Mitsugi
  • Process for producing 5-fluorouracil
    Patent number: 4186266
    Abstract: 5-Fluorouraacil is produced by reacting orotic acid with a fluorinating agent and then, decarboxylating the resulting 5-fluoro-orotic acid.
    Type: Grant
    Filed: June 7, 1978
    Date of Patent: January 29, 1980
    Assignees: Asahi Glass Company Limited, Ajinomoto Company Incorporated
    Inventors: Akihiro Yamazaki, Hirokazu Morisawa, Yoshio Oda, Keiichi Uchida