Patents by Inventor Kazumasa Yokoyama

Kazumasa Yokoyama 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: 5521287
    Abstract: Human serum albumin obtained by gene manipulation techniques can be purified by a combination of specified steps in which a culture supernatant obtained from a human serum albumin-producing host is subjected to ultrafiltration, heat treatment, acid treatment and another ultrafiltration, followed by subsequent treatments with a cation exchanger, a hydrophobic chromatography carrier and an anion exchanger, and by salting-out to thereby obtain a pure form of human serum albumin which contains substantially no proteinous and polysaccharide contaminants, which is formulated into a pharmaceutical preparation. The thus obtained human serum albumin can further be purified by treating recombinant human serum albumin with a hydrophobic chromatography carrier at pH of 2 to 5 and a salt concentration of 0.4 to 1 and exposing the carrier to a pH of 6 to 8 and a salt concentration of 0.01 to 0.
    Type: Grant
    Filed: February 25, 1994
    Date of Patent: May 28, 1996
    Assignee: The Green Cross Corporation
    Inventors: Takao Ohmura, Akinori Sumi, Wataru Ohtani, Naoto Furuhata, Kazuya Takeshima, Kaeko Kamide, Munehiro Noda, Masahide Kondo, Syoichi Ishikawa, Kazuhiro Oohara, Kazumasa Yokoyama, Nagatoshi Fujiwara
  • Patent number: 5462951
    Abstract: The orally administrable pharmaceutical compositions containing a slightly water-soluble drug, characterized by improved stability and improved absorption of the drug from digestive tract into blood. The use of the compositions of the present invention enables decrease of the dose amount of a slightly water-soluble drug, which eventually leads to alleviation of pains and side effects on the part of patients.
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: October 31, 1995
    Assignee: The Green Cross Corporation
    Inventors: Toru Iwao, Kenichi Hirai, Nobuo Kondoh, Koichi Yamanouchi, Kazumasa Yokoyama
  • Patent number: 5440018
    Abstract: Human serum albumin obtained by gene manipulation techniques can be purified by a combination of specified steps in which a culture supernatant obtained from a human serum albumin-producing host is subjected to ultrafiltration, heat treatment, acid treatment and another ultrafiltration, followed by subsequent treatments with a cation exchanger, a hydrophobic chromatography carrier and an anion exchanger, and by salting-out to thereby obtain a pure form of human serum albumin which contains substantially no proteinous and polysaccharide contaminants, which is formulated into a pharmaceutical preparation. This process makes it possible to effeciently purify recombinant human serum albumin and to provide substantially pure human serum albumin which does not contain producer host-related substances and other contaminants and is sufficiently free from coloration.
    Type: Grant
    Filed: March 24, 1993
    Date of Patent: August 8, 1995
    Assignee: The Green Cross Corporation
    Inventors: Takao Ohmura, Akinori Sumi, Wataru Ohtani, Naoto Fuluhata, Kazuya Takeshima, Kaeko Kamide, Munehiro Noda, Masahide Kondo, Syoichi Ishikawa, Kazuhiro Oohara, Kazumasa Yokoyama
  • Patent number: 5369020
    Abstract: A method for suppressing coloring of human serum albumin expressed by genetic engineering, which comprises culture and/or purification in the presence of an amine compound selected from the group consisting of alkylamines, diamines, guanidines, benzamidines, basic amino acids, and aminophenylacetic acids. According to the present invention, coloring of HSA expressed by genetic engineering can be suppressed to from one-half to one-tenth of that without treatment for coloring suppression. In addition, HSA can be recovered in high yields, and the treatment of the invention does not affect the inherent properties of HSA.
    Type: Grant
    Filed: March 16, 1993
    Date of Patent: November 29, 1994
    Assignee: The Green Cross Corporation
    Inventors: Akinori Sumi, Wataru Ohtani, Naoto Furuhata, Kazuya Takeshima, Kaeko Kamide, Takao Ohmura, Kazumasa Yokoyama
  • Patent number: 5334512
    Abstract: A method for producing human serum albumin which comprises cultivating a human serum albumin-producing host prepared by genetic engineering, in a medium containing a fatty acid having 10 to 26 carbon atoms, or its salt, and a method for cultivating the host. HSA production can be greatly increased by the present invention.
    Type: Grant
    Filed: March 20, 1992
    Date of Patent: August 2, 1994
    Assignee: The Green Cross Corporation
    Inventors: Kaoru Kobayashi, Shinobu Kuwae, Tomoshi Ooya, Hirotoshi Fukutsuka, Akinori Sumi, Wataru Ohtani, Takao Ohmura, Kazumasa Yokoyama
  • Patent number: 5277818
    Abstract: An albumin preparation having a polymer content of not more than 3% by weight based on the serum albumin content and an .alpha..sub.1 -AGP content of not more than a detectable limit based on the serum albumin content, which is prepared by removing a polymer-forming factor from an albumin aqueous solution by, for example, ion exchange separation or affinity chromatography, and subjecting the solution to a heat treatment.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: January 11, 1994
    Assignee: The Green Cross Corporation
    Inventors: Yasushi Matsuoka, Shinichiro Hase, Kazuo Takechi, Shinji Tomioka, Kazumasa Yokoyama
  • Patent number: 5214214
    Abstract: There is provided a novel perfluorochemical represented by the formula, ##STR1## wherein R.sub.F is a perfluoroalkyl group, a perfluoro alkoxyalkyl group or a perfluoroalkyloxy group, X and X' are same as or different from each other and are a fluorine atom or a perfluoroalkyl group, and Y is a perfluoroalkyloxy group or a perfluoro dialkylamino group, the total number of the carbon atoms contained being an integer of 8 to 11 inclusive. The perfluorochemical is prepared by perfluorinating the corresponding partially fluorinated compound which may have unsaturated hydrocarbon moiety, only with molecular fluorine in a stoichiometric excess amount in an inert solvent.The perfluorochemical is used for preparing a stable emulsion as blood substitutes or perfusion media.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: May 25, 1993
    Assignee: The Green Cross Corporation
    Inventors: Kirby V. Scherer, Jr., Kouichi Yamanouchi, Kazumasa Yokoyama, Kimie Naito
  • Patent number: 5171566
    Abstract: There is provided an ophthalmic preparation comprising a fat emulsion containing flurbiprofen or its derivative such as ester as an active ingredient.
    Type: Grant
    Filed: March 6, 1991
    Date of Patent: December 15, 1992
    Assignee: The Green Cross Corporation
    Inventors: Yutaka Mizushima, Hiroyuki Okamoto, Shigetoshi Sugio, Kazumasa Yokoyama, Tadakazu Suyama, Masao Tohno, Makoto Okumura, Yoshiaki Konishi, Kiyonoshin Ichikawa, Katsuhiro Uchida
  • Patent number: 5151499
    Abstract: A method of producing a virus-inactivated protein-containing composition from a protein-containing composition which may be contaminated with virus. The method according to the present invention permits production of pharmaceutically safer virus-inactivated protein preparations without spoiling the protein activity.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: September 29, 1992
    Assignee: The Green Cross Corporation
    Inventors: Shoju Kameyama, Kenmi Miyano, Motonori Hashimoto, Kazuo Takechi, Takao Ohmura, Yutaka Hirao, Yahiro Uemura, Kazumasa Yokoyama
  • Patent number: 5116949
    Abstract: A benzoyl urea compound-albumin complex comprising a benzoyl urea compound of the formula: ##STR1## wherein X is a halogen atom or a nitro group, Y is a hydrogen atom, a halogen atom, a nitro group or a trifluoromethyl group, Z.sub.1 is a halogen atom or a trifluoromethyl group, Z.sub.2 is a hydrogen atom or a halogen atom and A is CH or a nitrogen atom, and albumin.
    Type: Grant
    Filed: August 31, 1989
    Date of Patent: May 26, 1992
    Assignees: Ishihara Sangyo Kaisha Ltd., The Green Cross Corporation
    Inventors: Tsunetaka Nakajima, Tadao Okamoto, Nobuo Kondo, Masahiro Watanabe, Koichi Yamauchi, Kazumasa Yokoyama, Takahiro Haga, Nobutoshi Yamada, Hideo Sugi, Toru Koyanagi
  • Patent number: 5091417
    Abstract: A preventive and therapeutic agent for hepatitis, comprising a fat emulsion containing a compound having prostaglandin E.sub.1 activities.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: February 25, 1992
    Assignees: The Green Cross Corporation, Taisho Pharmaceutical Co., Ltd.
    Inventors: Masahiro Watanabe, Kazumasa Yokoyama
  • Patent number: 5053498
    Abstract: A therapeutic and prophylactic agent for peptic ulcers which contains as an active ingredient a compound of the general formula (I): ##STR1## wherein R.sub.1 represents hydrogen or .dbd.O; R.sub.2 represents hydrogen or --OR.sub.5 ; R.sub.3 represents hydrogen or --OR.sub.5 ; R.sub.4 represents --OR.sub.7 in the case of the absence of double bond; R.sub.5, R.sub.6 and R.sub.7 each represents hydrogen or an organic residue;X represents group (A);.dbd.C.dbd.CH--COR.sub.8 (A)or group (B): ##STR2## wherein R.sub.8 represents alkyl, and R.sub.9 and R.sub.10 each represents hydrogen or an organic residue; with the proviso that when X represents group (A), then R.sub.1 and R.sub.3 both represent hydrogen, R.sub.2 represents --OR.sub.5, R.sub.4 represents OR.sub.7 and the bond between the carbon atom to which X is attached and the carbon atom to which R.sub.4 is attached is a single bond, and when X represents group (B), then R.sub.1 represents .dbd.O, R.sub.2 represents hydrogen, R.sub.3 represents --OR.sub.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: October 1, 1991
    Assignee: Green Cross Corporation
    Inventors: Yusei Shiraga, Chikara Fukaya, Toshiaki Akira, Masakazu Iwai, Kazumasa Yokoyama, Mamoru Tabata, Hiroshi Fukui, Shigeo Tanaka, Yoshiro Iga, Tadakazu Suyama, Kanemichi Okano
  • Patent number: 5036072
    Abstract: Use of a benzoyl urea compound of the formula: ##STR1## wherein X is a halogen atom or a nitro group, Y is a hydrogen atom, a halogen atom, a nitro group or a trifluoromethyl group, Z.sub.1 is a halogen atom or a trifluoromethyl group, Z.sub.2 is a hydrogen atom or a halogen atom, and A is CH or a nitrogen atom, as an antiviral agent.
    Type: Grant
    Filed: January 23, 1990
    Date of Patent: July 30, 1991
    Assignee: Ishihara Sangyo Kaisha Ltd.
    Inventors: Tsunetaka Nakajima, Tadao Okamoto, Masahiro Watanabe, Kazumasa Yokoyama
  • Patent number: 5002952
    Abstract: A pharmaceutical composition comprising a benzoyl urea compound having the formula: ##STR1## wherein X is a halogen atom or a nitro group, Y is a hydrogen atom, a halogen atom, a nitro group or a trifluoromethyl group, Z.sub.1 is a halogen atom or a trifluoromethyl group, Z.sub.2 is a hydrogen atom or a halogen atom, and A is a .dbd.CH--group or a nitrogen atom, and a nonionic surfactant.
    Type: Grant
    Filed: July 27, 1989
    Date of Patent: March 26, 1991
    Assignees: Ishihara Sangyo Kaisha Ltd., The Green Cross Corporation
    Inventors: Nobuo Kondo, Tsunetaka Nakajima, Masahiro Watanabe, Kazumasa Yokoyama, Takahiro Haga, Nobutoshi Yamada, Hideo Sugi, Toru Koyanagi
  • Patent number: 4983605
    Abstract: A pharmaceutical composition comprising a benzoyl urea compound (A) selected from the group consisting of a benzoyl urea compound (I) having the formula: ##STR1## wherein X is a halogen atom, a nitro group or a trifluoromethyl group, provided that when Y is a nitro group, X is a halogen atom or a nitro group, Y is a hydrogen atom, a halogen atom, a nitro group or a trifluoromethyl group, Z.sub.1 is a halogen atom or a trifluoromethyl group, Z.sub.2 is a hydrogen atom or a halogen atom, and A is a .dbd.CH-- group or a nitrogen atom, and a benzoyl urea compound (II) having the formula: ##STR2## wherein each of X.sub.1 and X.sub.2 is a hydrogen atom, a halogen atom or a nitro group, provided that when Y is a nitro group, X.sub.
    Type: Grant
    Filed: October 20, 1987
    Date of Patent: January 8, 1991
    Assignees: Ishihara Sangyo Kaisha Ltd., The Green Cross Corporation
    Inventors: Nobuo Kondo, Masahiro Kikuchi, Tsunetaka Nakajima, Masahiro Watanabe, Kazumasa Yokoyama, Takahiro Haga, Nobutoshi Yamada, Hideo Sugi, Toru Koyanagi
  • Patent number: 4983723
    Abstract: A cycloalkane derivative represented by the formula (I): ##STR1## wherein A, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, Z, and n are as defined in the specification. The compounds of formula (I) exhibit activities against peptic ulcers and are useful as therapeutic and prophylactic agents for peptic ulcers.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: January 8, 1991
    Assignee: Green Cross Corporation
    Inventors: Hitoshi Yasuda, Chikara Fukaya, Kanemichi Okano, Kazumasa Yokoyama
  • Patent number: 4983584
    Abstract: A therapeutic and prophylactic agent for peptic ulcers comprising as an effective ingredient a cyclohexane derivative represented by general formula (I): ##STR1## wherein A represents a group shown by formula, >CH.sub.2, ##STR2## wherein X represents ethynylene, vinylene or ethylene, Y represents oxo or a hydroxy group; R.sup.1, R.sup.3, R.sup.4 and R.sup.5 each represents a hydrogen atom or alkyl; R.sup.2 represents a hydrogen atom, alkyl or a group shown by --OR.sup.8 ;R.sup.6 represents a hydrogen atom, oxo or a group shown by --OR.sup.8 ; and R.sup.7 represents a hydrogen atom or a group shown by --OR.sup.8, wherein R.sup.8 represents a hydrogen atom or an organic residue.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: January 8, 1991
    Assignee: Green Cross Corporation
    Inventors: Chikara Fukaya, Hitoshi Yasuda, Toshiaki Akira, Masakazu Iwai, Kanemichi Okano, Kazumasa Yokoyama
  • Patent number: 4943595
    Abstract: There is provided a novel perfluorochemical represented by the formula, ##STR1## wherein R.sub.F is a perfluoroalkyl group, a perfluoro alkoxyalkyl group or a perfluoroalkyloxy group, X and X' are same as or different from each other and are a fluorine atom or a perfluoroalkyl group, and Y is a perfluoroalkyloxy group or a perfluoro dialkylamino group, the total number of the carbon atoms contained being an integer of 8 to 11 inclusive. The perfluorochemical is prepared by perfluorinating the corresponding partially fluorinated compound which may have unsaturated hydrocarbon moiety, only with molecular fluorine in a stoichiometric excess amount in an inert solvent.The perfluorochemical is used for preparing a stable emulsion as blood substitutes or perfusion media.
    Type: Grant
    Filed: February 22, 1984
    Date of Patent: July 24, 1990
    Assignee: The Green Cross Corporation
    Inventors: Kirby V. Scherer, Jr., Kouichi Yamanouchi, Kazumasa Yokoyama, Ryoichi Naito, deceased
  • Patent number: 4933329
    Abstract: Novel bis-S-alkylbenzene derivatives capable of inhibiting lipoxygenase, inparticular, 5-lipoxygenase are disclosed. It is expected that the compounds, which are hardly metabolized in vivo, are highly useful in the treatment and/or prevention of various diseases, including allergic diseases such as asthma, inflammation, myocardial infarction, nephritis, scabies and gout.
    Type: Grant
    Filed: December 6, 1988
    Date of Patent: June 12, 1990
    Assignee: Green Cross Corporation
    Inventors: Youichiro Naito, Yasunari Yamaura, Masanori Sugiura, Chikara Fukaya, Kazumasa Yokoyama
  • Patent number: 4916130
    Abstract: An antithrombotic composition containing an amide derivative which is obtained by binding a sulfur-containing amine to an unsaturated fatty acid having 4 to 13 carbon atoms through an amide bond and which exerts a high platelet agglutination-inhibiting effect.
    Type: Grant
    Filed: September 8, 1988
    Date of Patent: April 10, 1990
    Assignee: Green Cross Corporation
    Inventors: Masakazu Iwai, Chikara Fukaya, Kazumasa Yokoyama