Patents by Inventor Koichi Niimura

Koichi Niimura 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: 5480878
    Abstract: Disclosed is a method for treating prostatic hypertrophy with an estradiol derivative-alkylating agent conjugate of the formula (1'): ##STR1## wherein R.sup.1 is C.sub.1-4 alkyl or C.sub.1-4 alkoxy; R.sup.2 is acyl or benzyl; m is an integer of 1 to 3; and n is an integer of 0 to 3. Also disclosed is the treatment of prostatic hypertrophy with an estradiol derivative of the formula (II): ##STR2## wherein R.sup.1 is C.sub.1-4 alkyl or C.sub.1-4 alkoxy; R.sup.2 is acyl or benzyl; m is an integer of 1 to 3; and n is an integer of 0 to 3; and X is hydroxy or halogen.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: January 2, 1996
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Koichi Niimura, Takako Kawabe, Tsutomu Wada, Tsuyoshi Saitoh, Kenji Bannai
  • Patent number: 5478818
    Abstract: Disclosed is an estradiol derivative-alkylating agent conjugate of the formula (I'): ##STR1## wherein R.sup.1 is C.sub.1-4 alkyl or C.sub.1-4 alkoxy; R.sup.2 is acyl or benzyl; m is an integer of 1 to 3; and n is an integer of 0 to 3, which is useful a growth inhibiting agent.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: December 26, 1995
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Koichi Niimura, Takako Kawabe, Tsutomu Wada, Tsuyoshi Saitoh, Kenji Bannai
  • Patent number: 5470960
    Abstract: A phenylalanine-glycine derivative of the general formula (I): ##STR1## wherein R represents a residue of an antitumor substance, or a salt or ester thereof, a process for preparation thereof, and a pharmaceutical composition containing the same are described.The novel conjugate of the phenylalanine-glycine derivative and the antitumor substance exhibits superior antitumor activity in comparison with the case wherein an antitumor substance is administered singly or as a mixture with phenylalanine.
    Type: Grant
    Filed: January 11, 1995
    Date of Patent: November 28, 1995
    Assignee: Kureha Chemical Industry Co., Ltd.
    Inventors: Koichi Niimura, Takako Kawabe, Takao Ando, Kenichi Saito
  • Patent number: 5462957
    Abstract: Azole derivatives (including stereoisomers and pharmaceutically acceptable salts) of the formula: ##STR1## wherein R.sub.1 and R.sub.2 each are H or C.sub.1 -C.sub.4 alkyl; R.sub.3 is H, OH, CN, halogen, haloalkyl, C.sub.1 -C.sub.4 alkyl or phenyl, and if there are two or more R.sub.3 groups, such R.sub.3 groups may be the same or different; n is an integer from 0 to 5; Y is N or CH; and X is O, S or NH have antimycotic and aromatase inhibitory activities. Compositions containing the azole derivatives and a method of treating mycosis and estrogen-dependent diseases by administering effective quantities of the azole derivatives are also disclosed.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: October 31, 1995
    Assignee: Kureha Chemical Industry Co., Ltd.
    Inventors: Koichi Niimura, Yuko Ikeda, Akira Kato, Takao Ando
  • Patent number: 5455268
    Abstract: A pharmaceutical composition comprising a compound of the general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are, independently, a hydrogen atom, a saturated or unsaturated aliphatic acyl having 2 to 25 carbon atoms or benzoyl group and R.sup.3 is a hydrogen atom or alkyl group, and a pharmaceutically acceptable carrier is disclosed. Further, a novel compound of the general formula (I) wherein R.sup.1 and R.sup.2 are, independently, a hydrogen atom, pivaloyl, capryloyl, lauroyl, palmitoyl, stearoyl, linoleoyl, docosahexaenoyl, or benzoyl group, and R.sup.3 is a hydrogen atom or methyl group, is also disclosed.
    Type: Grant
    Filed: March 2, 1994
    Date of Patent: October 3, 1995
    Assignee: Kureha Chemical Industry Co., Ltd.
    Inventors: Koju Watanabe, Koichi Niimura, Kiyonori Umekawa
  • Patent number: 5432190
    Abstract: Azole derivatives (including stereoisomers and pharmaceutically acceptable salts) of the formula: ##STR1## wherein R.sub.1 and R.sub.2 each are H or C.sub.1 -C.sub.4 alkyl; R.sub.3 is H, OH, CN, halogen, haloalkyl, C.sub.1 -C.sub.4 alkyl or phenyl, and if there are two or more R.sub.3 groups, such R.sub.3 groups may be the same or different; n is an integer from 0 to 5; Y is N or CH; and X is O, S or NH have antimycotic and aromatase inhibitory activities. Compositions containing the azole derivatives and a method of treating mycosis and estrogen-dependent diseases by administering effective quantities of the azole derivatives are also disclosed.
    Type: Grant
    Filed: January 19, 1994
    Date of Patent: July 11, 1995
    Assignee: Kureha Chemical Industry Co., Ltd.
    Inventors: Koichi Niimura, Yuko Ikeda, Akira Kato, Takao Ando
  • Patent number: 5411964
    Abstract: A phenylalanine-glycine compound of formula (I): ##STR1## wherein R represents a residue of an antitumor substance, or a salt or ester thereof, a process for preparation thereof, and a pharmaceutical composition containing the same are described. The novel conjugate of the phenylalanine-glycine compound and the antitumor substance exhibits superior antitumor activity in comparison with the case wherein an antitumor substance is administered alone or as a mixture with phenylalanine.
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: May 2, 1995
    Assignee: Kureha Chemical Industry Co., Ltd.
    Inventors: Koichi Niimura, Takako Kawabe, Takao Ando, Kenichi Saito
  • Patent number: 5324740
    Abstract: Azole derivatives (including stereoisomers and pharmaceutically acceptable salts) of the formula: ##STR1## wherein R.sub.1 and R.sub.2 each are H or C.sub.1 -C.sub.4 alkyl; R.sub.3 is H, OH, CN, halogen, haloalkyl, C.sub.1 -C.sub.4 alkyl or phenyl, and if there are two or more R.sub.3 groups, such R.sub.3 groups may be the same or different; n is an integer from 0 to 5; Y is N or CH; and X is O, S or NH have antimycotic and aromatase inhibitory activities. Compositions containing the azole derivatives and a method of treating mycosis and estrogen-dependent diseases by administering effective quantities of the azole derivatives are also disclosed.
    Type: Grant
    Filed: May 26, 1993
    Date of Patent: June 28, 1994
    Assignee: Kureha Chemical Industry Co., Ltd.
    Inventors: Koichi Niimura, Yuko Ikeda, Akira Kato, Takao Ando
  • Patent number: 5286737
    Abstract: This invention provides a method of inhibiting aromatase and treating of estrogen-dependent diseases in a patient by administering azole derivatives as nonsteroidal inhibitors. The azole derivative has the formula ##STR1## where R.sub.1 a is hydrogen or a (C.sub.1 -C.sub.5) alkyl; R.sub.2 is a hydrogen or a (C.sub.1 -C.sub.5) alkyl; R.sub.3 is any of a halogen, a (C.sub.1 -C.sub.5)alkyl, a haloalkyl, a phenyl, a cyano, or nitro; n is 0 to 5; and Y is a nitrogen atom or CH.
    Type: Grant
    Filed: September 16, 1992
    Date of Patent: February 15, 1994
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Akira Kato, Junko Miyagawa, Yuko Ikeda, Koichi Niimura
  • Patent number: 5116573
    Abstract: The present invention discloses a novel, labelled vitamin D.sub.3 derivative in which hydrogen atoms on the skeleton portion, i.e. 6- and 19-positions, are substituted with a deuterium atom or a tritium atom, as well as a novel production process of the labelled vitamin D.sub.3 derivative carried out by way of sulfur dioxide addition reaction of a vitamin D.sub.3 derivative. The labelled portion of the novel vitamin D.sub.3 is resistant against in vivo metabolism and make a long period tracing of its pharmacodynamics in a living body possible.
    Type: Grant
    Filed: September 7, 1989
    Date of Patent: May 26, 1992
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Sachiko Yamada, Koichi Niimura, Kenji Fukushima, Yuji Maeda
  • Patent number: 5089481
    Abstract: Disclosed herein are polysaccharides extracted from marine algae and an antiviral drug containing as active ingredient polysaccharides extracted from seaweeds.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: February 18, 1992
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Shigeaki Muto, Koichi Niimura, Minoru Oohara, Yoshiharu Oguchi, Kenichi Matsunaga, Kunitaka Hirose, Junji Kakuchi, Norifumi Sugita, Takao Furusho, Chikao Yoshikumi, Masaaki Takahashi
  • Patent number: 4985543
    Abstract: Disclosed herein are lectins extracted form a plant of the class Dicotyledoneae and an antiretoviral drug comprising as an active ingredient an effective amount of the lectins.
    Type: Grant
    Filed: June 17, 1988
    Date of Patent: January 15, 1991
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Norifumi Sugita, Koichi Niimura, Yoshiharu Oguchi, Kunitaka Hirose, Kenichi Matsunaga, Minoru Oohara, Shigeaki Muto, Junji Kakuchi, Takao Furusho, Chikao Yoshikumi, Masaaki Takahashi
  • Patent number: 4925662
    Abstract: Disclosed herein are an anti-tumor substance obtained by bonding an anti-tumor agent to human immunoglobulin, and a process for producing the same.
    Type: Grant
    Filed: January 14, 1988
    Date of Patent: May 15, 1990
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yoshiharu Oguchi, Koichi Niimura, Takayoshi Fujii, Masahiko Fujii, Kenichi Matsunaga, Chikao Yoshikumi
  • Patent number: 4758558
    Abstract: Disclosed herein are the derivatives of substituted cephalosporanic acid represented by the formula (I): ##STR1## wherein R.sup.1 represents a 4-pyridylthiomethyl group, an alpha-aminobenzyl group, a cyanomethyl group or a 1-tetrazolylmethyl group; R.sup.2 represents a hydrogen atom, an acetoxy group or a (5-methyl-1,3,4-thiadiazol-2-yl)thio group; R.sup.3 represents a hydrogen atom, a hydroxyl group, a carbamoyl group, an alkyl group having 1 to 4 carbon atoms or --(CONH).sub.m (CH.sub.2).sub.n --COOH wherein m is 0 or 1, n is 0, 1 or 2 and the carboxyl group may have been converted to a salt or an ester thereof; p is 0, 1 or 2 and X represents carbon atom or nitrogen atom, and antibiotics comprising the derivatives of substituted cephalosporanic acid represented by the formula (I).
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: July 19, 1988
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Akihiko Kanno, Shigeaki Muto, Koichi Niimura, Takao Ando, Takayoshi Fujii, Masahiko Fujii, Takao Furusho, Chikao Yoshikumi
  • Patent number: 4738843
    Abstract: Disclosed herein are an anti-tumor substance obtained by bonding an anti-tumor agent to human immunoglobulin, and a process for producing the same.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: April 19, 1988
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Yoshiharu Oguchi, Koichi Niimura, Takayoshi Fujii, Masahiko Fujii, Kenichi Matsunaga, Chikao Yoshikumi
  • Patent number: 4690920
    Abstract: Disclosed herein are a derivative of a substituted cephalosporanic acid, represented by the formula (I): ##STR1## wherein p is 0, 1 or 2 and R.sup.1 represents a hydrogen atom, a hydroxyl group, a carbamoyl group, an alkyl group having 1 to 4 carbon atoms or --(CONH).sub.m (CH.sub.2).sub.n --COOH wherein m is 0 or 1; n is 0, 1 or 2 and the carboxyl group may have been converted to the salt or the ester thereof, and an antibiotic comprising a derivative of substituted cephalosporanic acid represented by the formula (I).
    Type: Grant
    Filed: December 20, 1983
    Date of Patent: September 1, 1987
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Akihiko Kanno, Shigeaki Muto, Koichi Niimura, Takao Ando, Takayoshi Fujii, Masahiko Fujii, Takao Furusho, Chikao Yoshikumi
  • Patent number: 4504487
    Abstract: The present invention relates to a platinum compound having the formula ##STR1## wherein R represents hydrogen atom, an alkali metal atom or a lower alkyl group. The platinum compound is effective as an antitumor and antimicrobial drug.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: March 12, 1985
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Chikao Yoshikumi, Takayoshi Fujii, Kenichi Saito, Masahiko Fujii, Koichi Niimura
  • Patent number: 4401592
    Abstract: Disclosed is a novel pharmaceutical composition having antitumor (anti-cancer) activity without causing pyrexia and anaphylaxis, formed by an amide bonding between an antibody obtained by the purification of the antibody to tumor (cancer) antigen via affinity-chromatography and an antitumor substance (anti-cancer drug).
    Type: Grant
    Filed: November 16, 1981
    Date of Patent: August 30, 1983
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Chikao Yoshikumi, Takayoshi Fujii, Masahiko Fujii, Kenichi Matsunaga, Yoshiharu Oguchi, Koichi Niimura
  • Patent number: 4372890
    Abstract: The present invention relates to a platinum compound having the formula ##STR1## wherein R represents hydrogen atom, an alkali metal atom or a lower alkyl group. The platinum compound is effective as an antitumor and antimicrobial drug.
    Type: Grant
    Filed: May 21, 1981
    Date of Patent: February 8, 1983
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Chikao Yoshikumi, Takayoshi Fujii, Kenichi Saito, Masahiko Fujii, Koichi Niimura
  • Patent number: 4315851
    Abstract: Disclosed is a novel pharmaceutical composition having antitumor activity without causing pyrexia and anaphylaxis formed by an amido bonding between an antibody obtained by the purification of the antibody to tumor antigen via affinity-chromatography and an antitumor substance.
    Type: Grant
    Filed: December 14, 1979
    Date of Patent: February 16, 1982
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventors: Chikao Yoshikumi, Takayoshi Fujii, Masahiko Fujii, Kenichi Matsunaga, Yoshiharu Oguchi, Koichi Niimura