Patents by Inventor Takumi Kitahara

Takumi Kitahara 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).

  • Patent number: 6790319
    Abstract: A method for recovering a titanium compound includes bringing a waste solution containing a titanium alkoxide into contact with a halogenating agent to convert at least a part of the titanium alkoxide to a titanium halide, and then distilling the solution containing the titanium halide to recover the titanium halide from the solution, or the method includes distilling a waste solution containing a titanium alkoxide and a titanium halide to recover at least a part of the titanium halide from the waste solution, bringing a residue in a distiller after the distillation into contact with a halogenating agent to convert at least a part of the titanium alkoxide to a titanium halide, and distilling the solution containing the titanium halide to recover the titanium halide from the solution. The method can recover an increased amount of a titanium compound from a waste solution containing a titanium alkoxide.
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: September 14, 2004
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Takumi Kitahara, Tetsuya Nakano
  • Publication number: 20020110514
    Abstract: The method for recovering a titanium compound according to the invention comprises bringing a waste solution containing a titanium alkoxide into contact with a halogenating agent to convert at least apart of the titanium alkoxide to a titanium halide and then distilling the solution containing the titanium halide to recover the titanium halide from the solution, or comprises distilling a waste solution containing a titanium alkoxide and a titanium halide to recover at least a part of the titanium halide from the waste solution, bringing a residue in distiller given after the distillation into contact with a halogenating agent to convert at least a part of the titanium alkoxide to a titanium halide, and distilling the solution containing the titanium halide to recover the titanium halide from the solution. According to the method of the invention, a larger amount of a titanium compound can be recovered from a waste solution containing a titanium alkoxide.
    Type: Application
    Filed: November 28, 2001
    Publication date: August 15, 2002
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Takumi Kitahara, Tetsuya Nakano
  • Patent number: 5358945
    Abstract: The present invention relates to pyrimidine compounds represented by the formula ##STR1## (wherein X is a substituted or a cyclic amino group and Y is a substituted amino group or a substituted carbonyl group) or their pharmaceutically acceptable salts, and a therapeutic agent for neurological diseases comprising the compounds.These compounds are useful for treatment of various disorders in nervous systems since they are effective on growth of neurons and promotion of the formation and elongation of neutrites.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: October 25, 1994
    Assignees: Mitsui Petrochemical Industries, Ltd., Mitsui Pharmaceuticals, Inc.
    Inventors: Akira Mizuchi, Ken Ikeda, Yuichiro Kokubun, Kazutoshi Horikomi, Tadayuki Sasaki, Akira Awaya, Ikuo Tomino, Masaharu Ishiguro, Takumi Kitahara, Noriaki Kihara
  • Patent number: 5264435
    Abstract: 2,6-di-, 2,4,6-, 2,5,6-tri- or 2,4,5,6-tetra-substituted pyrimidines, and 2,6-di-substituted pyridines. These compounds are useful for treatment of neurological deseases.
    Type: Grant
    Filed: May 26, 1992
    Date of Patent: November 23, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Akira Mizuchi, Kazutoshi Horikomi, Tadayuki Sasaki, Akira Awaya, Ikuo Tomino, Noriaki Kihara, Takumi Kitahara
  • Patent number: 5192799
    Abstract: Amine represented by the following formula (1), or their acid addition salts or their quaternary ammonium salts. ##STR1## The amines of formula (1) or their pharmaceutically acceptable acid addition salts or quaternary ammonium salts are useful for the treatment and prevention of heart diseases of animals, particularly arrhythima, myocardial infarction, angina pectoris and heart failure and psychoneurological diseases.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: March 9, 1993
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Ikuo Tomino, Masaharu Ishiguro, Takumi Kitahara, Keiichi Yokoyama, Noriaki Kihara, Joji Kamiya, Kanji Yoshihara, Masaaki Ishii, Akira Mizuchi, Kazutoshi Horikomi, Akira Awaya, Takuo Nakano
  • Patent number: 4966968
    Abstract: Discloses indan derivatives represented by the general formula [1] ##STR1## wherein R is a lower alkoxy group, a phenoxy group, ##STR2## whereupon R.sup.1 and R.sup.2 are, respectively, a hydrogen atom, a lower alkyl, lower alkenyl, phenyl, or phenyl group substituted by halogen atoms, or a monopholino group.The indan derivatives demonstrated satisfactory results in respect of a weeding effect and safety in practical use.
    Type: Grant
    Filed: November 15, 1989
    Date of Patent: October 30, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Isao Hashimoto, Keiichi Yokoyama, Takumi Kitahara
  • Patent number: 4959368
    Abstract: A pharmaceutical composition comprising a pyrimidine represented by the following formula ##STR1## wherein R.sup.1 represents a hydrogen atom, an acyl group having 2 to 4 carbon atoms, an alkoxycarbonyl group having 2 to 5 carbon atoms, an alkoxycarbonylmethyl group having 3 to 5 carbon atoms, a 3,4-dimethoxybenzoyl group or a 3,4-methylenedioxybenzyl group,R.sup.2 represents a hydrogen atom, an amino group, a monoalkylamino group having 1 to 4 carbon atoms, an alkoxy group having 1 to 5 carbon atoms or an alkoxycarbonyl group having 2 to 4 carbon atoms,R.sup.3 represents a hydrogen atom, an alkoxycarbonyl group having 2 to 4 carbon atoms, a dialkylaminocarbonyl group having 1 to 9 carbon atoms in each alkyl moiety, an alkoxy group having 1 to 5 carbon atoms, or a hydroxyethyl group, R.sup.2 and R.sup.3, together with the carbon atoms to which they are bonded, may form a 5- to 7-membered carbocyclic ring or a heterocyclic ring having N, O or S as the hetero atom, and R.sup.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: September 25, 1990
    Assignees: Mitsui Petrochemical Industries Ltd., Mitsui Pharmaceuticals, Inc.
    Inventors: Akira Awaya, Takuo Nakano, Hisashi Kobayashi, Ken E. Tan, Kazutoshi Horikomi, Tadayuki Sasaki, Keiichi Yokoyama, Hiroyasu Ohno, Kozi Kato, Takumi Kitahara, Ikuo Tomino, Shigeru Isayama
  • Patent number: 4742165
    Abstract: The present invention relates to novel 2-piperazinopyrimidine derivatives represented by the following general formula [I] which are useful as, for example, an active ingredient of herbicides ##STR1## wherein R.sup.1 is a hydrogen atom or an aralkyl group and Y is one of the groups represented by the following general formulas [II] to [VII] ##STR2## (wherein a and b are positions to be bound to positions 4 and 5 of the pyrimidine ring of the formula [I], respectively; l.sub.1 and l.sub.2 each are an integer of 2 to 4; l.sub.3 is 2 or 0; l.sub.4 is 0 or 1, provided that l.sub.4 is 0 when l.sub.3 is 2 and l.sub.4 is 1 when l.sub.3 is 0; l.sub.5 is 2 or 3; l.sub.6 is 1 or 2; l.sub.7 is 2 or 3; R.sup.2 is a hydroxyl group or a toluenesulfonyloxy group; and R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 each are a hydrogen atom or a lower alkyl group).
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: May 3, 1988
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Keiichi Yokoyama, Tatsuyoshi Ishida, Shigeru Isayama, Kohji Kato, Takumi Kitahara, Yoshiaki Furuya
  • Patent number: 4734418
    Abstract: Disclosed herein is an antihypertensive preparation containing, as an active component, a novel quinazoline derivative represented by the following general formula or a salt thereof: ##STR1## wherein R.sup.100 means a hydrogen atom or methoxy group, R.sup.200 and R.sup.300 denote individually a hydrogen atom or lower alkoxy group, R.sup.400 is a hydrogen atom or amino group, l stands for 2 or 3, and Het is a specific hetero ring group.
    Type: Grant
    Filed: December 6, 1985
    Date of Patent: March 29, 1988
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Keiichi Yokoyama, Koji Kato, Takumi Kitahara, Hiroyasu Ohno, Takashi Nishina, Mikio Kumakura, Akira Awaya, Takuo Nakano, Kazuyuki Watanabe, Sakae Saruta