Patents by Inventor Piyasena Hewawasam

Piyasena Hewawasam 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).

  • Publication number: 20060166964
    Abstract: Indole compounds of Formula I are described. The compounds have activity against hepatitis C virus (HCV) and are useful in treating those infected with HCV. Different forms and compositions comprising the compounds are also described as well as methods of preparing the compounds.
    Type: Application
    Filed: February 3, 2006
    Publication date: July 27, 2006
    Inventors: Thomas Hudyma, Xiaofan Zheng, Feng He, Min Ding, Carl Bergstrom, Piyasena Hewawasam, Scott Martin, Robert Gentles
  • Patent number: 7049309
    Abstract: This invention describes compounds of Formula (I) which are modulators of potassium channels and are useful for treating conditions affected by abnormal potassium channel activity including erectile dysfunction and irritable bowel syndrome.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: May 23, 2006
    Assignee: Bristol-Myers Squibb Company
    Inventors: Kenneth M. Boy, Piyasena Hewawasam, Sing-Yuen Sit, Kai Xie
  • Publication number: 20060046983
    Abstract: Indole compounds of Formula I are described. The compounds have activity against hepatitis C virus (HCV) and are useful in treating those infected with HCV. Different forms and compositions comprising the compounds are also described as well as methods of preparing the compounds.
    Type: Application
    Filed: July 14, 2005
    Publication date: March 2, 2006
    Inventors: Thomas Hudyma, Xiaofan Zheng, Feng He, Min Ding, Carl Bergstrom, Piyasena Hewawasam, Scott Martin, Robert Gentles
  • Patent number: 6995174
    Abstract: Hepatitis C virus inhibitors are disclosed having the general formula: wherein R1, R2, R3, R?, B, Y and X are described in the description. Compositions comprising the compounds and methods for using the compounds to inhibit HCV are also disclosed.
    Type: Grant
    Filed: May 20, 2003
    Date of Patent: February 7, 2006
    Assignee: Bristol-Myers Squibb Company
    Inventors: Xiangdong Alan Wang, Li-Qiang Sun, Sing-Yuen Sit, Ny Sin, Paul Michael Scola, Piyasena Hewawasam, Andrew Charles Good, Yan Chen, Jeffrey Allen Campbell
  • Publication number: 20050203089
    Abstract: The present invention provides novel N-substituted fluorooxindoles having the general Formula I wherein the wavy bond represents the racemate, the (R)-enantiomer or the (S)-enantiomer and m, n, p, q, A, B, D, Q, X, and Z are as defined below, or a nontoxic pharmaceutically acceptable salt or solvate thereof and are useful in the treatment of disorders which are responsive to the opening of potassium channels.
    Type: Application
    Filed: March 7, 2005
    Publication date: September 15, 2005
    Inventors: John Starrett, Omar Lopez, Piyasena Hewawasam, Min Ding
  • Publication number: 20050187165
    Abstract: Compounds are disclosed having the general formula: wherein R1, R2, R3, R4, R?, B, Y and X are described in the description. Compositions comprising the compounds and methods for using the compounds to inhibit HCV are also disclosed.
    Type: Application
    Filed: November 10, 2004
    Publication date: August 25, 2005
    Inventors: Paul Scola, Fiona McPhee, Nicholas Meanwell, Piyasena Hewawasam, Jeffrey Campbell
  • Publication number: 20050176763
    Abstract: This invention describes compounds of Formula (I) which are modulators of potassium channels and are useful for treating conditions affected by abnormal potassium channel activity including erectile dysfunction and irritable bowel syndrome.
    Type: Application
    Filed: October 13, 2004
    Publication date: August 11, 2005
    Inventors: Kenneth Boy, Piyasena Hewawasam, Sing-Yuen Sit, Kai Xie
  • Publication number: 20050080082
    Abstract: This invention describes compounds of Formula (I) which are modulators of potassium channels and are useful for treating conditions affected by abnormal potassium channel activity including erectile dysfunction and irritable bowel syndrome.
    Type: Application
    Filed: October 13, 2004
    Publication date: April 14, 2005
    Inventors: Piyasena Hewawasam, Sing-Yuen Sit, John Starrett
  • Publication number: 20050080105
    Abstract: This invention describes compounds of Formula (I) which are modulators of potassium channels and are useful for treating conditions affected by abnormal potassium channel activity including erectile dysfunction and irritable bowel syndrome.
    Type: Application
    Filed: October 13, 2004
    Publication date: April 14, 2005
    Inventors: Kenneth Boy, Piyasena Hewawasam, Sing-Yuen Sit
  • Publication number: 20050043293
    Abstract: The present invention describes calcium sensitive and selective maxi-K potassium channel opener/activator compounds that function to open maxi-K channels under conditions of high intracellular calcium concentrations, and which do not significantly affect the opening of maxi-K channel proteins under conditions of low or physiologically normal intracellular calcium concentrations. Methods of assaying for and using such compounds are also provided. According to the invention, whole cell voltage patch-clamp studies newly demonstrated that the ability of opener compounds, e.g., fluoro-oxindoles and chloro-oxindoles, to open maxi-K channels was sensitive to the intracellular Ca2+ concentration ([Ca2+])i, i.e., more channels opened at more negative potentials. Particular fluoro-oxindole and chloro-oxindole compounds produced significant increases in whole-cell maxi-K potassium channel-mediated outward currents only in cells having higher [Ca2+]i, compared with effects in lower [Ca2+]i.
    Type: Application
    Filed: September 28, 2004
    Publication date: February 24, 2005
    Inventors: Valentin Gribkoff, Debra Post-Munson, Sarita Yeola, Christopher Boissard, Piyasena Hewawasam, John Starrett
  • Patent number: 6855829
    Abstract: Compounds which function as modulators, particularly, openers, of human KCNQ potassium channel proteins or polypeptides, particularly, central nervous system (CNS)-located KCNQ potassium channels, and heteromultimers thereof, and their use in the treatment of migraine are provided by the present invention. One novel type of potassium channel polypeptide openers provided by the present invention is the fluorooxindole compounds, described for the first time as therapeutics for the treatment of migraine by preventing the asynchronous firing of neurons. Other KCNQ potassium channel opener compounds that are also useful in the treatments of the invention include 2,4-disubstituted pyrimidine-5-carboxamide derivatives. One or more of the compounds according to the present invention may be utilized alone, in combination, or in conjunction with other treatment modalities for reducing, ameliorating and/or alleviating migraine or diseases similar to, or mechanistically related to, migraine, e.g., cluster headache.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: February 15, 2005
    Assignee: Bristol-Myers Squibb Company
    Inventors: Steven I. Dworetzky, Valentin K. Gribkoff, Gene G. Kinney, Piyasena Hewawasam
  • Patent number: 6831080
    Abstract: There is provided novel cinnamide derivatives of Formula I: wherein R is C1-4 alkyl or trifluoromethyl; R1 is selected from the group consisting of pyridinyl, quinolinyl, thienyl, furanyl, 1,4-benzodioxanyl, 1,3-benzodioxolyl, chromanyl, indanyl, biphenylyl, phenyl and substituted phenyl in which said substituted phenyl is substituted with one or two substituents each independently selected-from the group consisting of halogen, C1-4 alkyl, C1-4 alkoxy, trifluoromethyl, trifluoromethoxy and nitro; R2 and R3 are each independently selected from the group consisting of hydrogen, C1-4 alkyl, and halogen; R4 is selected from the group consisting of di(C1-4 alkyl)amino, trifluoromethoxy and optionally substituted morpholin-4-yl, pyridinyl, pyrimidinyl, piperazinyl, and pyrazinyl with one or two substituents in which said substituent is independently selected from the group consisting of C1-4 alkyl, aminomethyl, hydroxymethyl, chloro or fluoro; R5 is hydrogen, chloro or fluoro; or R4 and R5 taken t
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: December 14, 2004
    Assignee: Bristol-Myers Squibb Company
    Inventors: Yong-Jin Wu, Li-Quang Sun, Jie Chen, Huan He, Alexandre L'Heureux, Pierre Dextraze, Jean-Paul Daris, Gene G. Kinney, Steven I. Dworetzky, Piyasena Hewawasam
  • Publication number: 20040106559
    Abstract: Hepatitis C virus inhibitors are disclosed having the general formula: 1
    Type: Application
    Filed: May 20, 2003
    Publication date: June 3, 2004
    Inventors: Xiangdong Alan Wang, Li-Qiang Sun, Sing-Yuen Sit, Ny Sin, Paul Michael Scola, Piyasena Hewawasam, Andrew Charles Good, Yan Chen, Jeffrey Allen Campbell
  • Publication number: 20030166650
    Abstract: There is provided novel cinnamide derivatives of Formula I 1
    Type: Application
    Filed: May 31, 2002
    Publication date: September 4, 2003
    Inventors: Yong-Jin Wu, Li-Quang Sun, Jie Chen, Huan He, Alexandre L'Heureux, Pierre Dextraze, Jean-Paul Daris, Gene G. Kinney, Steven I. Dworetzky, Piyasena Hewawasam
  • Patent number: 6613786
    Abstract: The present invention provides novel [1,2,4]triazole-3-one derivatives having the general formula (I) wherein: Q is  and R1, R2, R3, R4, R5 and R6 are as defined herein or a nontoxic pharmaceutically acceptable salt or solvate thereof which are smooth muscle relaxants and useful in treating disorders responsive to relaxation of smooth muscle such as asthma, irritable bowel syndrome, male erectile dysfunction and urinary incontinence.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: September 2, 2003
    Assignee: Bristol-Myers Squibb Company
    Inventors: Piyasena Hewawasam, John E. Starrett, Dalton King, Li-Quang Sun, Nicholas J. Lodge
  • Publication number: 20030144333
    Abstract: The present invention provides novel [1,2,4]triazole-3-one derivatives having the general formula (I) 1
    Type: Application
    Filed: October 8, 2002
    Publication date: July 31, 2003
    Inventors: Piyasena Hewawasam, John E. Starrett, Dalton King, Li-Quang Sun, Nicholas J. Lodge
  • Publication number: 20020183335
    Abstract: There is provided a method of treatment for disorders responsive to the modulation of KCNQ potassium channels by administering to a mammal in need thereof a therapeutically effective amount of a 2,4-disubstituted pyrimidine-5-carboxamide derivative of the Formula I 1
    Type: Application
    Filed: February 14, 2002
    Publication date: December 5, 2002
    Inventors: Piyasena Hewawasam, Dharmpal S. Dodd, Charles D. Weaver, Pierre Dextraze, Valentin K. Gribkoff, Gene G. Kinney, Steven I. Dworetzky
  • Publication number: 20020156120
    Abstract: There is provided novel 3-fluoro-3-phenyl oxindole derivatives of Formula I 1
    Type: Application
    Filed: February 14, 2002
    Publication date: October 24, 2002
    Inventors: Piyasena Hewawasam, Pierre Dextraze, Valentin K. Gribkoff, Gene G. Kinney, Steven I. Dworetzky
  • Patent number: 6469042
    Abstract: There is provided novel 3-fluoro-3-phenyl oxindole derivatives of Formula I wherein R1, R2, R3 and R4 each are independently hydrogen, C1-4 alkyl, halogen, fluoromethyl, trifluoromethyl, phenyl, 4-methylphenyl or 4-trifluoromethylphenyl; R5 is C1-6 alkyl optionally substituted with one to three same or different groups selected from fluoro and chloro, provided R5 is not C1-6 alkyl when Y is O; Y is O or S; and R6 and R7 each are independently hydrogen, chloro, bromo or trifluoromethy; which are openers of the KCNQ potassium channels and are useful in the treatment of disorders which are responsive to the opening of the KCNQ potassium channels.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: October 22, 2002
    Assignee: Bristol-Myers Squibb Company
    Inventors: Piyasena Hewawasam, Pierre Dextraze, Valentin K. Gribkoff, Gene G. Kinney, Steven I. Dworetzky
  • Publication number: 20020128277
    Abstract: Compounds which function as modulators, particularly, openers, of human KCNQ potassium channel proteins or polypeptides, particularly, central nervous system (CNS)-located KCNQ potassium channels, and heteromultimers thereof, and their use in the treatment of migraine are provided by the present invention. One novel type of potassium channel polypeptide openers provided by the present invention is the fluorooxindole compounds, described for the first time as therapeutics for the treatment of migraine by preventing the asynchronous firing of neurons. Other KCNQ potassium channel opener compounds that are also useful in the treatments of the invention include 2,4-disubstituted pyrimidine-5-carboxamide derivatives. One or more of the compounds according to the present invention may be utilized alone, in combination, or in conjunction with other treatment modalities for reducing, ameliorating and/or alleviating migraine or diseases similar to, or mechanistically related to, migraine, e.g., cluster headache.
    Type: Application
    Filed: February 14, 2002
    Publication date: September 12, 2002
    Inventors: Steven I. Dworetzky, Valentin K. Gribkoff, Gene G. Kinney, Piyasena Hewawasam