Patents by Inventor Atsushi Kajiyama

Atsushi Kajiyama 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: 7189415
    Abstract: The present invention relates to a pharmaceutical composition useful for rapid disintegration, which comprises a sparingly soluble medicament held on a gel-forming water-soluble polymer as a solid dispersion, wherein it contains a salt substance that comprises an alkali and a weak or strong acid and has an endothermic standard enthalpy of solution or heat of solution. Since rapid disintegration of the pharmaceutical composition of the present invention and rapid dissolution of the medicament contained in the preparation can be made in the digestive tracts pH-independently, good bioavailability can be attained.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: March 13, 2007
    Assignee: Astellas Pharma Inc.
    Inventors: Hirokazu Takagi, Atsushi Kajiyama, Masahiro Yanagisawa
  • Publication number: 20070014856
    Abstract: The present invention relates to a pharmaceutical composition useful for rapid disintegration, which comprises a sparingly soluble medicament held on a gel-forming water-soluble polymer as a solid dispersion, wherein it contains a salt substance that comprises an alkali and a weak or strong acid and has an endothermic standard enthalpy of solution or heat of solution. Since rapid disintegration of the pharmaceutical composition of the present invention and rapid dissolution of the medicament contained in the preparation can be made in the digestive tracts pH-independently, good bioavailability can be attained.
    Type: Application
    Filed: September 19, 2006
    Publication date: January 18, 2007
    Inventors: Hirokazu Takagi, Atsushi Kajiyama, Masahiro Yanagisawa
  • Patent number: 6899899
    Abstract: The present invention relates to a pharmaceutical composition useful for rapid disintegration, which comprises a sparingly soluble medicament held on a gel-forming water-soluble polymer as a solid dispersion, wherein it contains a salt substance that comprises an alkali and a weak or strong acid and has an endothermic standard enthalpy of solution or heat of solution. Since rapid disintegration of the pharmaceutical composition of the present invention and rapid dissolution of the medicament contained in the preparation can be made in the digestive tracts pH-independently, good bioavailability can be attained.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: May 31, 2005
    Assignee: Yamanouchi Pharmaceutical Co., Ltd.
    Inventors: Hirokazu Takagi, Atsushi Kajiyama, Masahiro Yanagisawa
  • Publication number: 20050100598
    Abstract: The present invention relates to a quick disintegrating tablet in buccal cavity, comprising: a mixture, comprising a drug, a sugar (A), and an amorphous sugar (B), and after it is forming a tablet, it is humidified and dried. In particularly, the present invention relates to a quick disintegrating tablet in buccal cavity comprising: a mixture; comprising a drug, a sugar (A), and an amorphous sugar (B) which an amorphous-forming sugar in crystalline state is dissolved in a medicinally permitted solvent, the amorphous sugar is obtained from this solution by removing the solvent, and after it is forming a tablet, and it is humidified and dried. The tablet in the present invention is to provide stability against moisture at preserved, because the amorphous sugar changed to the crystalline state in a nonreversible reaction after it is humidified and dried in a manufacturing process.
    Type: Application
    Filed: October 7, 2004
    Publication date: May 12, 2005
    Applicants: Yamanouchi Pharma Technologies, Inc.
    Inventors: Takao Mizumoto, Yoshinori Masuda, Atsushi Kajiyama, Masahiro Yanagisawa, Janaki Ram Nyshadham
  • Publication number: 20050095289
    Abstract: The present invention relates to a pharmaceutical composition useful for rapid disintegration, which comprises a sparingly soluble medicament held on a gel-forming water-soluble polymer as a solid dispersion, wherein it contains a salt substance that comprises an alkali and a weak or strong acid and has an endothermic standard enthalpy of solution or heat of solution. Since rapid disintegration of the pharmaceutical composition of the present invention and rapid dissolution of the medicament contained in the preparation can be made in the digestive tracts pH-independently, good bioavailability can be attained.
    Type: Application
    Filed: November 30, 2004
    Publication date: May 5, 2005
    Inventors: Hirokazu Takagi, Atsushi Kajiyama, Masahiro Yanagisawa
  • Patent number: 6803054
    Abstract: The present invention relates to a quick disintegrating tablet in buccal cavity, comprising: a mixture, comprising a drug, a sugar (A), and an amorphous sugar (B), and after it is forming a tablet, it is humidified and dried. In particularly, the present invention relates to a quick disintegrating tablet in buccal cavity comprising: a mixture; comprising a drug, a sugar (A), and an amorphous sugar (B) which an amorphous-forming sugar in crystalline state is dissolved in a medicinally permitted solvent, the amorphous sugar is obtained from this solution by removing the solvent, and after it is forming a tablet, and it is humidified and dried. The tablet in the present invention is to provide stability against moisture at preserved, because the amorphous sugar changed to the crystalline state in a nonreversible reaction after it is humidified and dried in a manufacturing process.
    Type: Grant
    Filed: June 2, 2003
    Date of Patent: October 12, 2004
    Assignees: Yamanouchi Pharmaceutical Co., Ltd., Yamanouchi Pharma Technologies, Inc.
    Inventors: Takao Mizumoto, Yoshinori Masuda, Atsushi Kajiyama, Masahiro Yanagisawa, Janaki Ram Nyshadham
  • Publication number: 20030203022
    Abstract: The present invention relates to a quick disintegrating tablet in buccal cavity, comprising: a mixture, comprising a drug, a sugar (A), and an amorphous sugar (B), and after it is forming a tablet, it is humidified and dried. In particularly, the present invention relates to a quick disintegrating tablet in buccal cavity comprising: a mixture; comprising a drug, a sugar (A), and an amorphous sugar (B) which an amorphous-forming sugar in crystalline state is dissolved in a medicinally permitted solvent, the amorphous sugar is obtained from this solution by removing the solvent, and after it is forming a tablet, and it is humidified and dried.
    Type: Application
    Filed: June 2, 2003
    Publication date: October 30, 2003
    Applicants: Yamanouchi Pharmaceutical Co., Ltd., Yamanouchi Pharma Technologies, Inc.
    Inventors: Takao Mizumoto, Yoshinori Masuda, Atsushi Kajiyama, Masahiro Yanagisawa, Janaki Ram Nyshadham
  • Patent number: 6589554
    Abstract: The present invention relates to a quick disintegrating tablet in buccal cavity, comprising: a mixture, comprising a drug, a sugar (A), and an amorphous sugar (B), and after it is forming a tablet, it is humidified and dried. In particularly, the present invention relates to a quick disintegrating tablet in buccal cavity comprising: a mixture; comprising a drug, a sugar (A), and an amorphous sugar (B) which an amorphous-forming sugar in crystalline state is dissolved in a medicinally permitted solvent, the amorphous sugar is obtained from this solution by removing the solvent, and after it is forming a tablet, and it is humidified and dried. The tablet in the present invention is to provide stability against moisture at preserved, because the amorphous sugar changed to the crystalline state in a nonreversible reaction after it is humidified and dried in a manufacturing process.
    Type: Grant
    Filed: September 14, 2000
    Date of Patent: July 8, 2003
    Assignees: Yamanouchi Pharmaceutical Co., Ltd., Yamanouchi Pharma Technologies, Inc.
    Inventors: Takao Mizumoto, Yoshinori Masuda, Atsushi Kajiyama, Masahiro Yanagisawa, Janaki Ram Nyshadham
  • Publication number: 20030003146
    Abstract: The present invention relates to a pharmaceutical composition useful for rapid disintegration, which comprises a sparingly soluble medicament held on a gel-forming water-soluble polymer as a solid dispersion, wherein it contains a salt substance that comprises an alkali and a weak or strong acid and has an endothermic standard enthalpy of solution or heat of solution. Since rapid disintegration of the pharmaceutical composition of the present invention and rapid dissolution of the medicament contained in the preparation can be made in the digestive tracts pH-independently, good bioavailability can be attained.
    Type: Application
    Filed: July 9, 2002
    Publication date: January 2, 2003
    Applicant: YAMANOUCHI PHARMACEUTICAL CO., LTD.
    Inventors: Hirokazu Takagi, Atsushi Kajiyama, Masahiro Yanagisawa
  • Publication number: 20020031547
    Abstract: The present invention relates to a pharmaceutical composition useful for rapid disintegration, which comprises a sparingly soluble medicament held on a gel-forming water-soluble polymer as a solid dispersion, wherein it contains a salt substance that comprises an alkali and a weak or strong acid and has an endothermic standard enthalpy of solution or heat of solution. Since rapid disintegration of the pharmaceutical composition of the present invention and rapid dissolution of the medicament contained in the preparation can be made in the digestive tracts pH-independently, good bioavailability can be attained.
    Type: Application
    Filed: June 18, 1999
    Publication date: March 14, 2002
    Applicant: YAMANOUCHI PHARMACEUTICAL CO., LTD.
    Inventors: HIROKAZU TAKAGI, ATSUSHI KAJIYAMA, MASAHIRO YANAGISAWA
  • Patent number: 5258186
    Abstract: A coating material for controlling drug release, useful for long acting formulations--e.g. for once-a-day administration, and to a long acting granular composition comprising a drug (especially one conventionally difficult to prepare in long acting form) coated with the coating material. This composition may be mixed with other granular drug formulations. The drug-release controlling coating material comprising, in a specific ratio, one specific water-insoluble and low water-permeability polymers and two materials differing from each other in the pH-dependency of their solubility (pH-dependent polymer-materials).
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: November 2, 1993
    Assignee: Yamanouchi Pharmaceutical Co., Ltd.
    Inventors: Tadayoshi Ohmura, Muneo Fukui, Hiroshi Sugiura, Satoru Yoneya, Toshiharu Hosono, Atsushi Kajiyama
  • Patent number: 5028664
    Abstract: A coating material for controlling drug release, useful for long acting formulations--e.g. for once-a-day administration, and to a long acting granular composition comprising a drug (especially one conventionally difficult to prepare in long acting form) coated with the coating material. This composition may be mixed with other granular drug formulations. The drug-release controlling coating material comprising, in a specific ration, one specific water-insoluble and low water-permeability polymers and two materials differing from each other in the pH-dependency of their solubility (pH-dependent polymer-materials).
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: July 2, 1991
    Assignee: Yamanouchi Pharmaceutical Co., Ltd.
    Inventors: Tadayoshi Ohmura, Muneo Fukui, Hiroshi Sugiura, Satoru Yoneya, Toshiharu Hosono, Atsushi Kajiyama
  • Patent number: 4772475
    Abstract: A pharmaceutical controlled-release individual unit or multiple units formulation in which the individual unit comprises a granulation product obtained by adding a release controlling agent to a mixture of a physiologically active substance and units-forming substance(s) and granulating and resultant mixture, said granulation product (granules) being substantially not disintegrated but gradually releasing the physiologically active substance in the gastrointestinal tract.
    Type: Grant
    Filed: February 27, 1986
    Date of Patent: September 20, 1988
    Assignee: Yamanouchi Pharmaceutical Co., Ltd.
    Inventors: Muneo Fukui, Kouji Tomuro, Shigeru Masuyama, Atsushi Kajiyama, Tamio Hikosaka, Masayoshi Aruga, Saburo Higuchi, Yoshiaki Soeishi