Patents by Inventor Sidney Liang

Sidney Liang 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: 20080319227
    Abstract: The present invention generally relates to an improved process for preparing modafinil and analogs thereof. The process minimizes impurities and improves the overall yield by oxidizing a modafinil intermediate compound in a reaction mixture including an alcohol and an organic acid at a ratio of from about 1:1 to about 80:1 (by volume).
    Type: Application
    Filed: November 27, 2006
    Publication date: December 25, 2008
    Inventors: Sidney Liang, John R. Duchek, Carl J. Schaefer
  • Patent number: 7345188
    Abstract: The present invention is directed to an improved process for preparing modafinil wherein benzhydrylthioacetate is prepared in high yield and purity by the reaction of a haloacetate with the reaction product of thiourea and benzhydrol. The reaction employing the haloacetate is conducted in a solvent comprising an organic solvent such as methanol having dissolved therein an organic base or an inorganic basic salt such as sodium bicarbonate. The resulting benzhydrylthioacetate can be amidated and then oxidized to provide the pharmaceutical grade modafinil in high yield and purity.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: March 18, 2008
    Assignee: Mallinckrodt Inc.
    Inventor: Sidney Liang
  • Publication number: 20080064734
    Abstract: The present invention relates to anilinopyrazole compounds, pharmaceutical compositions, and methods for treating diabetes and related disorders.
    Type: Application
    Filed: August 31, 2007
    Publication date: March 13, 2008
    Applicant: Bayer Pharmaceuticals Corporation
    Inventors: Joachim Rudolph, Louis-David Cantin, Steven Magnuson, William Bullock, Ann-Marie Bullion, Libing Chen, Chih-Yuan Chuang, Sidney Liang, Dyuti Majumdar, Herbert Ogutu, Alan Olague, Ning Qi, Philip Wickens
  • Publication number: 20080027240
    Abstract: The present invention is directed to an improved process for preparing modafinil wherein benzhydrylthioacetate is prepared in high yield and purity by the reaction of a haloacetate with the reaction product of thiourea and benzhydrol. The reaction employing the haloacetate is conducted in a solvent comprising an organic solvent such as methanol having dissolved therein an organic base or an inorganic basic salt such as sodium bicarbonate. The resulting benzhydrylthioacetate can be amidated and then oxidized to provide the pharmaceutical grade modafinil in high yield and purity.
    Type: Application
    Filed: October 22, 2004
    Publication date: January 31, 2008
    Inventor: Sidney Liang
  • Publication number: 20080009531
    Abstract: The present invention relates to 5-anilino-4-heteroarylpyrazole compounds, pharmaceutical compositions, and methods for treating diabetes and related disorders.
    Type: Application
    Filed: May 20, 2005
    Publication date: January 10, 2008
    Applicant: Bayer Pharmaceuticals Corporation
    Inventors: Louis Cantin, Xin Ma, Christiana Akuche, Sidney Liang
  • Publication number: 20070281957
    Abstract: The present invention relates to novel crystalline polymorphic forms of levorphanol including hydrated, solvated, and non-hydrated (non-solvated) forms. The invention also describes methods of preparing the various polymorphic forms. The present invention also relates to pharmaceutical compositions containing crystalline polymorphs of levorphanol, as well as methods of relieving pain by administering the pharmaceutical compositions.
    Type: Application
    Filed: May 24, 2007
    Publication date: December 6, 2007
    Applicant: Mallinckrodt Inc.
    Inventors: Sidney Liang, Gary A. Nichols, Michelle R. Menze
  • Patent number: 7265144
    Abstract: The present invention relates to anilinopyrazole compounds, pharmaceutical compositions, and methods for treating diabetes and related disorders.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: September 4, 2007
    Assignee: Bayer Pharmaceuticals Corporation
    Inventors: Joachim Rudolph, Louis-David Cantin, Steven Magnuson, William Bullock, Ann-Marie Bullion, Libing Chen, Chih-Yuan Chuang, Sidney Liang, Dyuti Majumdar, Herbert Ogutu, Alan Olague, Ning Qi, Philip L. Wickens
  • Patent number: 7244865
    Abstract: The present invention is directed to an improved process for preparing modafinil wherein benzhydrylthioacetamide is prepared in high yield and purity by the reaction of a haloacetamide with the reaction product of thiourea and benzhydrol in aqueous solution. The reaction employing the haloacetamide is conducted in a solvent comprising water and an organic solvent such as dimethylformamide having dissolved therein a basic salt such as potassium carbonate. The resulting benzhydrylthioacetamide can be oxidized to provide the pharmaceutical modafinil.
    Type: Grant
    Filed: February 23, 2004
    Date of Patent: July 17, 2007
    Assignee: Mallinckrodt Inc.
    Inventor: Sidney Liang
  • Publication number: 20060189609
    Abstract: The invention relates generally to naphthyridine derivatives of the formula wherein one of U, X, Y and Z is nitrogen and the others are C—R, where R is hydrogen or a substituent. More specifically, the invention relates to 1,8-naphthyridine derivatives and pharmaceutical compositions containing such derivatives. Methods of the invention comprise administration of a naphthyridine derivative of the invention for the treatment of diabetes and related disorders.
    Type: Application
    Filed: April 21, 2006
    Publication date: August 24, 2006
    Applicant: Bayer Pharmaceuticals Corporation
    Inventors: Yamin Wang, William Bullock, David Gunn, Qingjie Liu, Sidney Liang, Donglei Liu, Steven Magnuson, Tindy Li, Eric Mull, Jill Wood, Ning Qi
  • Publication number: 20060160903
    Abstract: The present invention is directed to an improved process for preparing modafinil wherein benzhydrylthioacetamide is prepared in high yield and purity by the reaction of a haloacetamide with the reaction product of thiourea and benzhydrol in aqueous solution. The reaction employing the haloacetamide is conducted in a solvent comprising water and an organic solvent such as dimethylformamide having dissolved therein a basic salt such as potassium carbonate. The resulting benzhydrylthioacetamide can be oxidized to provide the pharmaceutical modafinil.
    Type: Application
    Filed: February 23, 2004
    Publication date: July 20, 2006
    Inventor: Sidney Liang
  • Publication number: 20060084680
    Abstract: This invention relates to novel indane acetic acid derivatives which are useful in the treatment of diseases such as diabetes, obesity, hyperlipidemia, and atherosclerotic diseases. The invention also relates to intermediates useful in preparation of indane acetic derivatives and to methods of preparation.
    Type: Application
    Filed: December 19, 2003
    Publication date: April 20, 2006
    Applicant: Bayer Pharmaceuticals Corporation
    Inventors: Louis-David Cantin, Soongyu Choi, Roger Clark, Martin Hentemann, Xin Ma, Joachim Rudolph, Sidney Liang, Christiana Akuche, Rico Lavoie, Libing Chen, Dyuti Majumdar, Philip Wickens
  • Publication number: 20050222206
    Abstract: The present invention relates to compounds of formula I: or pharmaceutically acceptable acid addition salts thereof, where; R1 is C1-C6 alkyl, substituted C1-C6 alkyl, C3-C7 cycloalkyl, substituted C3-C7 cycloalkyl, C3-C7 cycloalkyl-C1-C3 alkyl, substituted C3-C7 cycloalkyl-C1-C3 alkyl, phenyl, substituted phenyl, heterocycle, or substituted heterocycle; R2 is hydrogen, C1-C3 alkyl, C3-C6 cycloalkyl-C1-C3 alkyl, or a group of formula II R3 is hydrogen or C1-C3 alkyl; R4 is hydrogen, halo, or C1-C3 alkyl; R5 is hydrogen or C1-C3 alkyl; R6 is hydrogen or C1-C6 alkyl; and n is an integer from 1 to 6 inclusively. The compounds of the present invention are useful for activating 5-HT1F receptors, inhibiting neuronal protein extravasation, and for the treatment or prevention of migraine in a mammal. The present invention also relates to a process for the synthesis of intermediates in the synthesis of compounds of Formula I.
    Type: Application
    Filed: March 27, 2003
    Publication date: October 6, 2005
    Inventors: Michael Cohen, Daniel Kohlman, Sidney Liang, Vincent Mancuso, Yao-Chang Xu, Bai-Ping Ying, DeAnna Zacherl, Deyi Zhang, Frantz Victor
  • Publication number: 20050107392
    Abstract: This invention relates to novel indane acetic acid derivatives which are useful in the treatment of diseases such as diabetes, obesity, hyperlipidemia, and atherosclerotic diseases and to pharmaceutical compositions containing these compounds.
    Type: Application
    Filed: April 16, 2003
    Publication date: May 19, 2005
    Applicant: Bayer Pharmaceuticals Corporation
    Inventors: Philip Wickens, Louis-David Cantin, Ellalahewage Kumarasinghe, Chih-Yuan Chuang, Sidney Liang
  • Publication number: 20040157904
    Abstract: The present invention relates to anilinopyrazole compounds, pharmaceutical compositions, and methods for treating diabetes and related disorders.
    Type: Application
    Filed: November 21, 2003
    Publication date: August 12, 2004
    Applicant: Bayer Pharmaceuticals Corporation
    Inventors: Joachim Rudolph, Louis-David Cantin, Steven Magnuson, William Bullock, Ann-Marie Bullion, Libing Chen, Chih-Yuan Chuang, Sidney Liang, Dyuti Majumdar, Herbert Ogutu, Alan Olague, Ning Qi, Philip L. Wickens