Patents by Inventor Ramabhadra Sarma Mamillapalli

Ramabhadra Sarma Mamillapalli 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: 8377950
    Abstract: The present invention relates to novel crystalline Form of 5-[4-[[3-methyl-4-oxo-3,4-dihydroquinazolin-2-yl]methoxy]benzyl]thiazolidine-2,4-dione potassium salt having the formula (I). The invention also relates to a pharmaceutical composition comprising the novel crystalline Form and a pharmaceutically acceptable carrier. The novel crystalline Form of the present invention is more active, as an antidiabetic agent than the hitherto known 5-[4-[[3-methyl-4-oxo-3,4-dihydroquinazolin-2-yl]methoxy]benzyl]thiazolidine-2,4-dione potassium salt.
    Type: Grant
    Filed: March 14, 2003
    Date of Patent: February 19, 2013
    Assignee: Dr. Reddy's Laboratories Limited
    Inventors: Rajender Kumar Potlapally, Raju Srisilla, Ramabhadra Sarma Mamillapalli, Om Reddy Gaddam
  • Patent number: 7241895
    Abstract: This invention relates to novel polymorphic/pseudopolymorphic forms of 5-[4-[2[N-methyl-N-(2-pyridyl)amino]ethoxy]benzyl]thiazolidine-2,4-dione maleate having formula (I). The invention also relates to a pharmaceutical composition comprising the novel polymorphic form or their mixture and a pharmaceutically acceptable carrier.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: July 10, 2007
    Assignees: Dr. Reddy's Laboratories Limited, Dr. Reddy's Laboratories, Inc.
    Inventors: Prabhakar Chebiyyam, Ramabhadra Sarma Mamillapalli, Vyas Krishnamurthi, Vishnuvardhan Reddy Seella, Om Reddy Gaddam
  • Patent number: 7223881
    Abstract: The present invention relates to an improved process for the preparation of novel antidiabetic compounds having formula (1) where R1 represents hydrogen or lower alkyl group and X represents hydrogen or halogen atom
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: May 29, 2007
    Assignee: Dr. Reddy's Laboratories Limited
    Inventors: Mahender Rao Siripragada, Prabhakar Chebiyyam, Rajender Kumar Potlapally, Chandra Sekhar Batchu, Ramabhadra Sarma Mamillapalli, Om Reddy Gaddam
  • Patent number: 6897199
    Abstract: The present invention relates to pharmaceutically acceptable salts of compound of the general formula (I), their derivatives, their analogs, their tautomeric forms, their stereoisomers, their polymorphs, their pharmaceutically acceptable solvates and pharmaceutically acceptable compositions containing them.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: May 24, 2005
    Assignee: Dr. Reddy's Laboratories Ltd.
    Inventors: Om Reddy Gaddam, Ramabhadra Sarma Mamillapalli, Prabhakar Chebiyyam, Madhusudan Gutta
  • Publication number: 20040248849
    Abstract: The present invention relates to novel antidiabetic compounds, their derivatives, their analogs, their tautomeric forms, their stereoisomers, their polymorphs and pharmaceutically acceptable compositions containing them. More particularly, the present invention relates to novel 3-aryl-&agr;-oxy substituted propanoic acids of the general formula (I), their derivatives, their analogs, their tautomeric forms, their stereoisomers, their polymorphs and pharmaceutically acceptable compositions containing them. Formula (I) where R1 represents t-butyldimethyl silyl, trimethyl silyl or alkoxyalkyl group; R2 represents hydrogen or substituted or unsubstituted (C1-C6)alkyl group.
    Type: Application
    Filed: July 28, 2004
    Publication date: December 9, 2004
    Inventors: Rajender Kumar Potlapally, Venkata Rama Murali Krishna Reddy Velagala, Ramabhadra Sarma Mamillapalli, Om Reddy Gaddam
  • Publication number: 20040068116
    Abstract: This invention relates to novel polymorphic/pseudopolymorphic forms of 5-[4-[2[N-methyl-N-(2-pyridyl)amino]ethoxy]benzyl] thiazolidine-2,4-dione maleate having formula (I). The invention also relates to a pharmaceutical composition comprising the novel polymorphic form or their mixture and a pharmaceutically acceptable carrier. The polymorphic forms of the present invention are more active, as antidiabetic agent, than the hitherto known 5-[4-[2-[N-(2-methyl-N-(2-pyridyl)amino]ethoxy]benzyl] thiazolidine-2,4-dione maleate.
    Type: Application
    Filed: November 7, 2003
    Publication date: April 8, 2004
    Inventors: Prabhakar Chebiyyam, Ramabhadra Sarma Mamillapalli, Vyas Krishnamurthi, Vishnuvardhan Reddy Seella, Om Reddy Gaddam
  • Publication number: 20030125553
    Abstract: The present invention relates to an improved process for the preparation of novel antidiabetic compounds having formula (1) where R1 represents hydrogen or lower alkyl group and X represents hydrogen or halogen atom.
    Type: Application
    Filed: December 20, 2002
    Publication date: July 3, 2003
    Applicant: DR. REDDY'S LABORATORIES LIMITED
    Inventors: Mahender Rao Siripragada, Prabhakar Chebiyyam, Rajender Kumar Potlapally, Chandra Sekhar Batchu, Ramabhadra Sarma Mamillapalli, Om Reddy Gaddam
  • Patent number: 6531596
    Abstract: The present invention relates to an improved process for the preparation of novel antidiabetic compounds having formula (1) where R1 represents hydrogen or lower alkyl group and X represents hydrogen or halogen atom.
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: March 11, 2003
    Assignee: Dr. Reddy's Laboratories Ltd.
    Inventors: Mahender Rao Siripragada, Prabhakar Chebiyyam, Rajender Kumar Potlapally, Chandra Sekhar Batchu, Ramabhadra Sarma Mamillapalli, Om Reddy Gaddam
  • Patent number: 6528507
    Abstract: This invention relates to novel polymorphic/pseudopolymorphic forms of arginine salt of 3-[4-[2-(phenoxazin-10-yl)ethoxy]phenyl]-2-ethoxypropanoic acid, having the formula I shown below. The invention also relates to a pharmaceutical composition comprising the novel polymorphic form or their mixture and a pharmaceutically acceptable carrier. The polymorphic forms of the present invention are more active, as antidiabetic and hypolipidemic agent, than the novel 3-[4-[2-(phenoxazin-10-yl)ethoxy]phenyl]-2-ethoxypropanoic acid.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: March 4, 2003
    Assignee: Dr. Reddy's Laboratories Limited
    Inventors: Om Reddy Gaddam, Ra jender Kumar Potlapally, Ra ju Sirisilla, Vyas Krishnamurthi, Sreenivasa Rao Dharmaraja, Ramabhadra Sarma Mamillapalli
  • Publication number: 20020173647
    Abstract: This invention relates to novel polymorphic/pseudopolymorphic forms of arginine salt of 3-[4-[2-(phenoxazin-10-yl)ethoxy]phenyl]-2-ethoxypropanoic acid, having the formula I shown below. The invention also relates to a pharmaceutical composition comprising the novel polymorphic form or their mixture and a pharmaceutically acceptable carrier. The polymorphic forms of the present invention are more active, as antidiabetic and hypolipidemic agent, than the novel 3-[4-[2-(phenoxazin-10-yl)ethoxy]phenyl]-2-ethoxypropanoic acid.
    Type: Application
    Filed: May 9, 2002
    Publication date: November 21, 2002
    Applicant: Dr. Reddy's Research Foundation
    Inventors: Om Reddy Gaddam, Rajender Kumar Potlapally, Raju Sirisilla, Vyas Krishnamurthi, Sreenivasa Rao Dharmaraja, Ramabhadra Sarma Mamillapalli, Soren Ebdrup, Petra Christine Lugstein
  • Publication number: 20020169175
    Abstract: The present invention relates to pharmaceutically acceptable salts of the general formula (I), their derivatives, their analogs, their tautomeric forms, their stereoisomers, their polymorphs, their pharmaceutically acceptable solvates and pharmaceutically acceptable compositions containing them.
    Type: Application
    Filed: February 4, 2002
    Publication date: November 14, 2002
    Applicant: DR. REDDY'S LABORATORIES LTD.
    Inventors: Om Reddy Gaddam, Chandra Sekhar Batchu, Rajender Kumar Potlapally, Ramabhadra Sarma Mamillapalli, Bheema Rao Paraselli, Naga Venkata Srinivasa Rao Mamidi
  • Publication number: 20020169146
    Abstract: The present invention relates to pharmaceutically acceptable salts of compound of the general formula (I), their derivatives, their analogs, their tautomeric forms, their stereoisomers, their polymorphs, their pharmaceutically acceptable solvates and pharmaceutically acceptable compositions containing them.
    Type: Application
    Filed: February 4, 2002
    Publication date: November 14, 2002
    Applicant: DR. REDDY'S LABORATORIES LTD.
    Inventors: Om Reddy Gaddam, Ramabhadra Sarma Mamillapalli, Prabhakar Chebiyyam, Madhusudan Gutta
  • Patent number: 6469167
    Abstract: An improved process for the preparation of 5-[4-[[3-Methyl-4-oxo-3,4-dihydroquinazolin-2-yl]methoxy]benzyl]thiazolidine-2,4-dione of formula (1) which comprises: reducing the compound of formula (2′) where R represents a (C1-C4)alkyl group using Raney Nickel or Magnesium in alcohol having 1 to 4 carbon atoms or mixtures thereof, if desired reesterifying using sufphuric acid at a temperature in the range of 0° C. to 60° C. to obtain a compound of formula (3′) wherein R is as defined above, hydrolyzing the compound of formula (3′) wherein R is as defined above, by conventional methods to obtain the acid of formula (4), condensing the acid of formula (4) with N-methyl anthranilamide directly without any preactivation of the acid to produce the compound of formula (1) and if desired, converting the compound of formula (1) to pharmaceutically acceptable salts thereof by conventional methods.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: October 22, 2002
    Assignee: Dr. Reddy's Research Foundation
    Inventors: Prabhakar Chebiyyam, Rajender Kumar Potlapally, Chinna Bakki Reddy Gade, Balaram Mahanti Satish, Ramabhadra Sarma Mamillapalli, Om Reddy Gaddam
  • Publication number: 20020142993
    Abstract: The present invention relates to pharmaceutically acceptable salts of compound of the general formula (I), their derivatives, their analogs, their tautomeric forms, their stereoisomers, their polymorphs, their pharmaceutically acceptable solvates and pharmaceutically acceptable compositions containing them.
    Type: Application
    Filed: October 10, 2001
    Publication date: October 3, 2002
    Applicant: DR. REDDY'S LABORATORIES LTD.
    Inventors: Om Reddy Gaddam, Chandra Sekhar Batchu, Ramabhadra Sarma Mamillapalli, Prasad Sivarama Addanki