Patents by Inventor Ambarish Singh

Ambarish Singh 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).

  • Process for the preparation of entecavir and novel intermediates thereof via carbon-silicon oxidation
    Publication number: 20050272932
    Abstract: Processes for preparing entecavir and novel intermediates thereof using carbon-silicon oxidation.
    Type: Application
    Filed: June 2, 2005
    Publication date: December 8, 2005
    Inventors: Maotang Zhou, Emily Reiff, Purushotham Vemishetti, Yadagiri Pendri, Ambarish Singh, Siva Prasad, Ulhas Dhokte, Xinhua Qian, Pia Mountford, Kerry Hartung, Helen Sailes
  • Methods for the preparation of biphenyl isoxazole sulfonamides
    Patent number: 6313308
    Abstract: Methods for the preparation of biphenyl isoxazole sulfonamides and intermediates therof. The present invention also relates to the novel intermediates prepared by these methods. The biphenyl isoxazole sulfonamides prepared by the present methods are endothelin antagonists useful, inter alia, for the treatment of hypertension, congestive heart failure and male erectile dysfunction.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: November 6, 2001
    Assignee: Bristol-Myers Squibb Company
    Inventors: Ambarish Singh, Chien-Kuang Chen, John A. Grosso, Edward J. Delaney, Xuebao Wang, Richard P. Polniaszek, John K. Thottathil
  • 7-oxabicycloheptane carboxylic acid prostaglandin analog intermediates useful in the preparation of anti-thrombotic and anti-vasospastic compounds and method for preparing same
    Patent number: H1737
    Abstract: A method is provided for preparing intermediates for 7-oxabicycloheptane carboxylic acid intermediates of the structures ##STR1## wherein R is alkyl, aryl, arylalkyl or cycloalkyl; R.sup.1 is alkyl, arylalkyl or cycloalkyl; R.sup.2 is aryl or arylalkyl; and of the structure ##STR2## where R and R.sup.1 are as defined above, which may be used in making the final anti-thrombotic--anti-vasospastic compounds.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: June 2, 1998
    Assignee: Bristol-Myers Squibb Company
    Inventors: Shankar Swaminathan, Philip M. Sher, Ambarish Singh, Wen-Sen Li, John J. Venit