Patents by Inventor Ramachandra A. Rao

Ramachandra A. Rao 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: 9000158
    Abstract: In an embodiment, the present invention provides a process for preparing (?)-6-(4-aminophenyl)-5-methylpyridazin-3-(2H)-one, which process comprises: a) reacting racemic 6-(4-aminophenyl)-4,5-dihydro-5-methyl-3-(2H)-pyridazinone of formula II with a chiral tartaric acid derivative to obtain a diastereomeric salt of (?)-6-(4-aminophenyl)-4,5-dihydro-5-methyl-3-(2H)-pyridazinone and the chiral tartaric acid derivative; and b) reacting the diastereomeric salt with a base to obtain (?)-6-(4-aminophenyl)-4,5-dihydro-5-methyl-3-(2H)-pyridazinone. The (?)-6-(4-aminophenyl)-4,5-dihydro-5-methyl-3-(2H)-pyridazinone may be used to prepare levosimendan.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: April 7, 2015
    Assignee: Cipla Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Manjinder Singh Phull, Ashwini Amol Sawant
  • Patent number: 8993789
    Abstract: The present invention provides a process for preparing methyl 5-acetamido-4-amino-6-(1,2,3-triacetoxypropyl)-5,6-dihydro-4H-pyran-2-carboxylate (V), which process comprises reducing methyl 5-acetamido-4-azido-6-(1,2,3-triacetoxypropyl)-5,6-dihydro-4H-pyran-2-carboxylate (IV) in the presence of a reducing agent selected from the group consisting of lithium aluminum hydride, sodium borohydride, zinc/ammonium chloride, zinc-ferric chloride and ferric chloride/sodium iodide. The present invention also provides compounds of formula (VIII) and (IX) which may be used in the synthesis of zanamivir. The present invention also provides processes for preparing compounds (VIII) and (IX) and processes involving their use, including in the synthesis of zanamivir.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: March 31, 2015
    Assignee: Cipla Limited
    Inventors: Manjinder Singh Phull, Rajendra Narayanrao Kankan, Dharmaraj Ramachandra Rao, Ashwini Amol Sawant, Sanoj Thoppil
  • Patent number: 8987458
    Abstract: The present invention provides a process for preparing donepezil or a salt thereof, the process comprising reducing a 1-benzyl-4-[(5,6-dimethoxy-1-indanon-2-yl)methylene]pyridonium halide of formula II, wherein X is bromide or chloride, in the presence of an ionic compound, a solvent, a catalyst and a source of hydrogen, to form donepezil and optionally converting the donepezil to the salt thereof.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: March 24, 2015
    Assignee: Cipla Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Srinivas Laxminarayan Pathi
  • Publication number: 20150080579
    Abstract: The present invention provides dexrabeprazole magnesium hydrate and a process for its preparation. The present invention also provides a magnesium, calcium or potassium salt of dexrabeprazole, optionally in amorphous form, and processes for its preparation.
    Type: Application
    Filed: November 19, 2014
    Publication date: March 19, 2015
    Inventors: Dharmaraj Ramachandra RAO, Rajendra Narayanrao KANKAN, Srinivas Laxminarayan PATHI, Dilip Ramdas BIRARI
  • Patent number: 8957255
    Abstract: The disclosure relates to a method of oxidation of an aliphatic C—H bond in an organic compound using CdO2 or ZnO2 nanoparticles as oxidizing agents. The instant disclosure relates to a method of oxidizing toluene using metal peroxide nanoparticles such as CdO2, ZnO2 as oxidizing agents to obtain oxidized products predominantly comprising benzaldehyde.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: February 17, 2015
    Assignee: Jawaharlal Nehru Centre for Advanced Scientific Research
    Inventors: Chintamani Nagesa Ramachandra Rao, Ujjal Kam Gautam, Srinivasa Rao Lingampalli
  • Publication number: 20150045382
    Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex and therapeutic uses of the complex.
    Type: Application
    Filed: October 22, 2014
    Publication date: February 12, 2015
    Inventors: Maruti Ganpati Ghagare, Sunilkumar Parasnath Saroj, Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan
  • Publication number: 20150037275
    Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex and therapeutic uses of the complex.
    Type: Application
    Filed: October 22, 2014
    Publication date: February 5, 2015
    Inventors: Maruti Ganpati Ghagare, Sunilkumar Parasnath Saroj, Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan
  • Patent number: 8924336
    Abstract: Feature and deployment recommendation systems and methods for content management systems comprises a vendor-site deployment and one or more customer-site deployments. The vendor-site deployment is configured to recommend an adaptation of any of the one or more customer-site deployments. The vendor-site deployment including a customer configuration repository adapted to store content usage metrics received from one or more customer-site deployments, an analytical engine configured to generate content usage patterns based on the stored content usage metrics, and a recommendation engine configured to recommend the adaptation.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: December 30, 2014
    Assignee: Oracle International Corporation
    Inventors: Hari Charan Ramachandra Rao, Chandrasekhar Atla, Govinda Raj Sambamurthy
  • Patent number: 8916193
    Abstract: There is provided a complex comprising rifaximin and a complexing agent, wherein the complexing agent is a polyvinyl pyrrolidone (PVP) or a cyclodextrin. There is also provided a process for preparing the complex, a pharmaceutical composition including the complex, and therapeutic uses of the complex.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: December 23, 2014
    Assignee: Cipla Limited
    Inventors: Maruti Ganpati Ghagare, Sunilkumar Parasnath Saroj, Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan
  • Patent number: 8912337
    Abstract: The present invention provides dexrabeprazole magnesium hydrate and a process for its preparation. The present invention also provides a magnesium, calcium or potassium salt of dexrabeprazole, optionally in amorphous form, and processes for its preparation.
    Type: Grant
    Filed: June 24, 2011
    Date of Patent: December 16, 2014
    Assignee: Cipla Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Srinivas Laxminarayan Pathi, Dilip Ramdas Birari
  • Patent number: 8848199
    Abstract: The present invention relates to systems and methods for quantitative three-dimensional mapping of refractive index in living or non-living cells, tissues, or organisms using a phase-shifting laser interferometric microscope with variable illumination angle. A preferred embodiment provides tomographic imaging of cells and multicellular organisms, and time-dependent changes in cell structure and the quantitative characterization of specimen-induced aberrations in high-resolution microscopy with multiple applications in tissue light scattering.
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: September 30, 2014
    Assignee: Massachusetts Institute of Technology
    Inventors: Wonshik Choi, Ramachandra Rao Dasari, Christopher M. Fang-Yen, Michael S. Feld
  • Publication number: 20140256004
    Abstract: The present invention relates to a novel process for the preparation of a compound of formula (I) wherein R is a methyl or methoxy group; to certain novel intermediates prepared in such a process and their use.
    Type: Application
    Filed: October 19, 2012
    Publication date: September 11, 2014
    Applicant: CIPLA LIMITED
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Sanjay Naik, Maruti Ghagare, Sandip Vasant Chikhalikar
  • Patent number: 8812464
    Abstract: In specific embodiments, a content management system operable on one or more microprocessors comprises a content repository storing a plurality of content items and a content usage analyzer. The computer is usable to perform one or more operations on one or more contents items stored in the content repository, and when an operation is performed on a content item, audit data is captured related to the operation. The content usage analyzer is configured to identify an idle content item within the content repository based on the captured audit data.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: August 19, 2014
    Assignee: Oracle International Corporation
    Inventors: Govinda Raj Sambamurthy, Hari Charan Ramachandra Rao
  • Publication number: 20140194624
    Abstract: A process for the preparation of a salt of N-(3-ethynylphenyl)-6,7-bis(2-methoxyethoxy)quinazolin-4-amine comprising reacting a 4-halo-6,7-bis(2-methoxyethoxy)quinazoline with 3-aminophenyl acetylene or an acid salt thereof under acidic conditions to form the corresponding acid salt of N-(3-ethynylphenyl)-6,7-bis(2-methoxyethoxy)quinazolin-4-amine, the process optionally further comprising converting the acid salt of N-(3-ethynylphenyl)-6,7-bis(2-methoxyethoxy)quinazolin-4-amine to N-(3-ethynylphenyl)-6,7-bis(2-methoxyethoxy)quinazolin-4-amine.
    Type: Application
    Filed: January 13, 2014
    Publication date: July 10, 2014
    Applicant: Cipla Limited
    Inventors: Dharmaraj Ramachandra RAO, Rajendra Narayanrao KANKAN
  • Publication number: 20140171689
    Abstract: The disclosure relates to a method of oxidation of an aliphatic C—H bond in an organic compound using CdO2 or ZnO2 nanoparticles as oxidizing agents. The instant disclosure relates to a method of oxidizing toluene using metal peroxide nanoparticles such as CdO2, ZnO2 as oxidizing agents to obtain oxidized products predominantly comprising benzaldehyde.
    Type: Application
    Filed: October 4, 2013
    Publication date: June 19, 2014
    Applicant: Jawaharlal Nehru Centre for Advanced Scientific Research
    Inventors: Chintamani Nagesa Ramachandra Rao, Ujjal Kam Gautam, Srinivasa Rao Lingampalli
  • Patent number: 8735589
    Abstract: The present invention relates to a process for preparing naratriptan or a salt thereof, the process comprising: (a) reacting a compound of formula (3) with a compound of the formula HCCR wherein Z is a protecting group, Y is a leaving group and R is a trialkyl silyl group, a trialkylstannyl group or a zinc (II) halide, to obtain the compound of formula (4); (b) converting the compound of formula (4) to a compound of formula (5) wherein Z? is hydrogen or a benzyl group; (c) converting the compound of formula (5) to naratriptan; and (d) optionally converting naratriptan to a salt thereof. The present invention also provides novel compounds (3) and (4) and processes for their preparation.
    Type: Grant
    Filed: August 18, 2010
    Date of Patent: May 27, 2014
    Assignee: Cipla Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Sandip Vasant Chikhalikar, Maruti Ghagare
  • Publication number: 20140128419
    Abstract: Amorphous rifaximin, methods of making it, and pharmaceutical compositions containing it. Also described are methods of converting amorphous rifaximin to crystalline rifaximin and vice versa.
    Type: Application
    Filed: January 10, 2014
    Publication date: May 8, 2014
    Applicant: CIPLA LIMITED
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Manjinder Singh Phull
  • Patent number: 8716476
    Abstract: A process for preparing alfuzosin or a salt thereof comprising: (a) condensing 4-amino-2-chloro-6,7-dimethoxyquinazoline with 3-methylaminopropionitrile in the presence of a polar aprotic solvent selected from the group consisting of diglyme, dimethyl formamide, t-butanol, hexamethylphosphoramide or mixtures thereof to form N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methyl-2-cyanoethylamine (b) hydrogenating the N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methyl-2-cyanoethylamine using a hydrogenating agent under a pressure of less than 10 kg/cm2 to form N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methylpropylenediamine and optionally converting the N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methylpropylenediamine to an acid addition salt thereof; and (c) converting tetrahydrofuroic acid to an intermediate form and condensing the intermediate form with the N-(4-amino-6,7-dimethoxyquinazol-2-yl)-N-methylpropylenediamine or with the acid addition salt to yield alfuzosin base, and optionally converting alfuzosin base to a
    Type: Grant
    Filed: August 1, 2008
    Date of Patent: May 6, 2014
    Assignee: Cipla Limited
    Inventors: Rajendra Narayanrao Kankan, Dharmaraj Ramachandra Rao, Dilip Birari
  • Patent number: 8691999
    Abstract: An improved process for the preparation of telmisartan, or a pharmaceutically acceptable salt thereof, comprises subjecting 1H-Benzimidazole-2-n-propyl-4-methyl-6-(1?-methyl benzimidazole-2?yl)] of formula (II), and methyl-4-(bromomethyl)biphenyl-2-carboxylate of formula (III) to condensation and hydrolysis in a single step:
    Type: Grant
    Filed: May 10, 2005
    Date of Patent: April 8, 2014
    Assignee: Cipla Limited
    Inventors: Rajendra Narayanrao Kankan, Dharmaraj Ramachandra Rao, Srinivas Laxminarayan Pathi, Ravikumar Puppala
  • Publication number: 20140057318
    Abstract: The present disclosure relates to a field of recombinant DNA therapeutics. It involves the bio-informatics design, synthesis of artificial gene for human insulin precursor including leader peptide coding sequence, cloning in an expression vector and expression in an organism, preferably Pichia pastoris. The present disclosure also relates to methods of downstream processing for obtaining protein precursor molecules and subsequent conversion of precursor molecules to functional proteins.
    Type: Application
    Filed: August 22, 2013
    Publication date: February 27, 2014
    Applicant: BIGTEC PRIVATE LIMITED
    Inventors: Mulakkapurath Narayanan Manoj, Venkata Ramachandra Rao Vasamsetty, Madhuri Baliga, Kirubakaran Naveen Kumar, Chandrasekhar Bhaskaran Nair, Pillarisetti Venkata Subbarao