Patents by Inventor Hiroharu Tanikawa

Hiroharu Tanikawa 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).

  • Method for purifying 5? -protected thymidines and novel derivatives thereof
    Patent number: 6875860
    Abstract: This invention provides a method for efficiently purifying 5?-protected thymidines which cannot be efficiently purified by the prior art. Impurities can be separated by obtaining crystals including a carbonyl-containing solvent to provide a highly pure 5?-protected thymidine. Thus, this invention allows 5?-protected thymidines, which cannot be purified in an industrial scale by the prior art, to be easily provided with a high purity in a large scale.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: April 5, 2005
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hironori Komatsu, Toshiyuki Kouno, Katsutoshi Tsuchiya, Hiroharu Tanikawa, Hiroki Ishibashi
  • Process for the preparation of cytidine derivatives
    Patent number: 6822090
    Abstract: An efficient method for producing cytidine derivatives that took away the previous drawbacks by efficiently synthesizing cytidine derivatives by utilizing a tertiary amine can be provided.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: November 23, 2004
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Kunihiko Morizane, Hiroharu Tanikawa, Toshiyuki Kouno, Hironori Komatsu, Nobuyuki Fukazawa
  • Process for the preparation of cytidine derivatives
    Publication number: 20030032797
    Abstract: An efficient method for producing cytidine derivatives that took away the previous drawbacks by efficiently synthesizing cytidine derivatives by utilizing a tertiary amine can be provided.
    Type: Application
    Filed: March 6, 2002
    Publication date: February 13, 2003
    Inventors: Kunihiko Morizane, Hiroharu Tanikawa, Toshiyuki Kouno, Hironori Komatsu, Nobuyuki Fukazawa
  • Method for purifying 5' -protected thymidines and novel derivatives thereof
    Publication number: 20030004331
    Abstract: This invention provides a method for efficiently purifying 5′-protected thymidines which cannot be efficiently purified by the prior art. Impurities can be separated by obtaining crystals including a carbonyl-containing solvent to provide a highly pure 5′-protected thymidine. Thus, this invention allows 5′-protected thymidines, which cannot be purified in an industrial scale by the prior art, to be easily provided with a high purity in a large scale.
    Type: Application
    Filed: May 15, 2002
    Publication date: January 2, 2003
    Inventors: Hironori Komatsu, Toshiyuki Kouno, Katsutoshi Tsuchiya, Hiroharu Tanikawa, Hiroki Ishibashi
  • Isothiazolecarboxylic acid derivatives, rice blast control agents containing the same as active ingredients, and rice blast control method applying the control agents
    Patent number: 5240951
    Abstract: Application of a rice blast control agent containing an isothiazolecarboxylic acid derivative of the below-described formula, which shows excellent activity against rice blast (Pyricularia oryzae) in rice cultivation, to the water surface of a paddy rice field results in the absorption of the derivative through roots of rice plants, so that the resistance of the rice plants can be enhanced. ##STR1## wherein R.sup.1 and R.sup.2 independently mean a hydrogen or halogen atom or a particular group, and Y stands for an OR.sub.3 group (R.sup.3 being a hydrogen or alkali metal atom or a particular group), an NHR.sup.4 group (R.sup.4 being a hydrogen atom or a particular group), or a morpholino group.
    Type: Grant
    Filed: September 19, 1991
    Date of Patent: August 31, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Hitoshi Shimotori, Yuji Yanase, Takeshi Sekino, Katsutoshi Ishikawa, Toshiaki Kuwatsuka, Hiroharu Tanikawa, Hideo Kawashima, Naofumi Tomura, Yoshiro Kanemoto
  • Pyrimidinyloxy(thio)quinoline derivative, and agri-horticultural fungicide comprising the derivative as active ingredient
    Patent number: 5202329
    Abstract: Pyrimidinyloxy(thio)quinoline derivatives represented by the formula (I) which exhibit an excellent controlling effect for plant diseases and are also safe for crop plants, preparation processes of the derivatives, and agri-horticultural fungicides comprising the derivatives as an active ingredient, are disclosed. ##STR1## In the formula (I), X is an oxygen atom or sulfur atom, Y is a hydrogen atom or halogen atom, Z is a hydrogen atom or methyl, R.sup.1 and R.sup.2 are methoxy or methyl, and n is an integer of 1 or 2.
    Type: Grant
    Filed: March 11, 1992
    Date of Patent: April 13, 1993
    Assignee: Mitsui Toatsu Chemicals Inc.
    Inventors: Katsutoshi Ishikawa, Yukihiro Yoshikawa, Tsutomu Ishii, Hiroharu Tanikawa, Sunao Maeda, Hideo Kawashima, Yuji Yanese, Hitoshi Shimotori, Ryuichi Mita