Patents by Inventor Venkata Naga Brahmeswara Rao Mandava

Venkata Naga Brahmeswara Rao Mandava 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).

  • Eszopiclone process
    Patent number: 8058438
    Abstract: Eszopiclone is prepared by reacting zopiclone with an enatiomerically pure di-p-toluoyl tartaric acid, recovering a solid salt, and reacting a solid salt with a base. Zopiclone is prepared by reacting 6-(5-chloropyrid-2-yl)-5-hydroxy-7-oxo-5,6-dihydropyrrolo[3,4-b]-pyrazine with 1-chlorocarbonyl-4-methylpiperazine hydrochloride.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: November 15, 2011
    Assignees: Dr. Reddy's Laboratories Limited, Dr. Reddy's Laboratories, Inc.,
    Inventors: Venkata Naga Brahmeswara Rao Mandava, Sreenadhacharyulu Kandala, Mukunda Reddy Jambula, Raveendra Reddy Chinta
  • Preparation of rivastigmine and its salts
    Patent number: 8013181
    Abstract: There are provided processes for making rivastigmine. In one embodiment, the process includes reacting S-(?)-[1-(3-hydroxyphenyl)ethyl]dimethylamine with N-ethyl-N-methyl carbamoyl chloride in the presence of an organic base to obtain a free base of rivastigmine.
    Type: Grant
    Filed: April 10, 2008
    Date of Patent: September 6, 2011
    Assignees: Dr. Reddy's Laboratories Limited, Dr. Reddy's Laboratories, Inc.
    Inventors: Venkata Naga Brahmeswara Rao Mandava, Venkata Reddy Vajrala, Ganesh Varanasi, Vijay Kumar Adla, Mukund Reddy Jambula, Vijaypal Reddy Kanumathi Reddy
  • Process for preparing bisphosphonic acids
    Patent number: 8003820
    Abstract: A process for preparing a bisphosphonate compound comprises reacting a carboxylic acid with a phosphonating agent, in a cresol solvent.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: August 23, 2011
    Assignees: Dr. Reddy's Laboratories Limited, Dr. Reddy's Laboratories, Inc.
    Inventors: Venkata Naga Brahmeswara Rao Mandava, Radha Krishna Singam Setty, Nagaraju Manne
  • ESZOPICLONE PROCESS
    Publication number: 20090099359
    Abstract: Eszopiclone is prepared by reacting zopiclone with an enatiomerically pure di-p-toluoyl tartaric acid, recovering a solid salt, and reacting a solid salt with a base. Zopiclone is prepared by reacting 6-(5-chloropyrid-2-yl)-5-hydroxy-7-oxo-5,6-dihydropyrrolo[3,4-b]-pyrazine with 1-chlorocarbonyl-4-methylpiperazine hydrochloride.
    Type: Application
    Filed: December 19, 2008
    Publication date: April 16, 2009
    Applicants: DR. REDDY'S LABORATORIES LIMITED, DR. REDDY'S LABORATORIES, INC.
    Inventors: Venkata Naga Brahmeswara Rao Mandava, Sreenadhacharyulu Kandala, Mukunda Reddy Jambula, Raveendra Reddy Chinta
  • Eszopiclone process
    Patent number: 7476737
    Abstract: Eszopiclone is prepared by reacting zopiclone with an enatiomerically pure di-p-toluoyl tartaric acid, recovering a solid salt, and reacting a solid salt with a base. Zopiclone is prepared by reacting 6-(5-chloropyrid-2-yl)-5-hydroxy-7-oxo-5,6-dihydropyrrolo[3,4-b]-pyrazine with 1-chlorocarbonyl-4-methylpiperazine hydrochloride.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: January 13, 2009
    Assignees: Dr. Reddy's Laboratories Limited, Dr. Reddy's Laboratories, Inc.
    Inventors: Venkata Naga Brahmeswara Rao Mandava, Sreenadhacharyulu Kandala, Mukunda Reddy Jambula, Raveendra Reddy Chinta
  • PREPARATION OF RIVASTIGMINE AND ITS SALTS
    Publication number: 20080255383
    Abstract: There are provided processes for making rivastigmine. In one embodiment, the process includes reacting S-(?)-[1-(3-hydroxyphenyl)ethyl]dimethylamine with N-ethyl-N-methyl carbamoyl chloride in the presence of an organic base to obtain a free base of rivastigmine.
    Type: Application
    Filed: April 10, 2008
    Publication date: October 16, 2008
    Inventors: Venkata Naga Brahmeswara Rao Mandava, Venkata Reddy Vajrala, Ganesh Varanasi, Vijay Kumar Adla, Mukund Reddy Jambula, Vijaypal Reddy Kanumathi Reddy
  • PREPARATION OF ROSIGLITAZONE AND ITS SALTS
    Publication number: 20070293546
    Abstract: The present invention relates to rosiglitazone and its pharmaceutically acceptable salts free of at least one of the process related impurities, in particular the dehydro and the succinic acid impurities of rosiglitazone, wherein said impurities are present in an amount of about 05 mg to not more than about 15 mg, and processes for their preparation.
    Type: Application
    Filed: June 15, 2007
    Publication date: December 20, 2007
    Inventors: Srinivasula Reddy Maddula, Kushal Surajmal Manudhane, Sridhar Thota, Arvind Mallinath Lali, Sandeep Bhaskar Kale, Venkata Naga Brahmeswara Rao Mandava, Radhakrishna Singam Setty, Sandeep Mohonty, Jaga Gangaraju Pericherla, Manoj Ramesh Kharkar