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).

  • Publication number: 20130150588
    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: June 24, 2011
    Publication date: June 13, 2013
    Applicant: CIPLA LIMITED
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Srinivas Laxminarayan Pathi, Dilip Ramdas Birari
  • Patent number: 8461334
    Abstract: The present invention provides a process for the preparation of the dextrorotatory isomer of zopiclone (eszopiclone). The present invention also provides eszopiclone di-p-anisolyl-L-tartrate and eszopiclone diacetyl-L-tartrate, which are useful as intermediates in a process for preparing eszopiclone.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: June 11, 2013
    Assignee: Cipla Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Maruti Ganpati Ghagare, Sunilkumar Parasnath Saroj
  • Patent number: 8461388
    Abstract: A process for preparing a compound of formula (V) or its enantiomer, which comprises: (a) reacting racemic aminoindan of formula (II) or its enantiomer with allylhalide in presence of a base and an organic solvent at a temperature ranging from 25 C to the reflux temperature of the solvent to give compound of formula (III); Where R is H or (b) reacting the compound (III) with halogenating agent in a suitable organic solvent to give a dihalo compound of formula (IV). (c) treating the dihalo compound (IV) with a suitable base to give compound (V).
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: June 11, 2013
    Assignee: CIPLA Limited
    Inventors: Manjinder Singh Phull, Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan
  • Patent number: 8445687
    Abstract: There is provided a process for preparing sorafenib or a salt thereof comprising the use of a compound of formula (A) wherein R? is selected from the group consisting of hydrogen, —C(O)OA, —C(O)CX3, —C(O)NH2, —C(O)—NHOH or There is also provided intermediate compounds of general formula (A), N-methyl-4-(4-ureidophenoxy)picolinamide, 4-(2-(methylcarbamoyl)pyridin-4-yloxy)phenylcarbamate derivative and N-methyl-4-(4-(2,2,2-trihaloacetamido)phenoxy)picolinamide, processes for their preparation and their use in the preparation of sorafenib.
    Type: Grant
    Filed: September 10, 2008
    Date of Patent: May 21, 2013
    Assignee: Cipla Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Maruti Ghagare, Sandip Chikhalikar
  • Patent number: 8431037
    Abstract: An embodiment relates to a liquid composite dielectric material (LCDM) comprising a metal-containing dispersed phase material in an organic liquid phase material, wherein the liquid composite dielectric material has a dielectric permittivity (?r) of 10000 or more at 40 Hz and a dielectric loss (tan ?) of 1 or less at 40 Hz.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: April 30, 2013
    Assignee: Indian Institute of Technology Madras
    Inventors: Sri Ramachandra Rao Mamidanna, Ramachandran Balakrishnan
  • Patent number: 8426590
    Abstract: The present invention relates to a process for the preparation of doxazosin or salts thereof.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: April 23, 2013
    Assignee: Cipla Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Dilip Ramdas Birari
  • Patent number: 8394963
    Abstract: A process for preparing Form A of (S)-5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl) -methyl]sulfinyl]-1H-benzimidazole magnesium dihydrate, processes for preparing various intermediates useful in the preparation of Form A of (S)-5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)-methyl]sulfinyl]-1H-benzimidazole magnesium dihydrate and a novel polymorphic Form II of 5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)-methyl]thio]-1H-benzimidazole.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: March 12, 2013
    Assignee: Cipla Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Srinivas Laxminarayan Pathi, Gopalakrishna Sumana Bangalore
  • Patent number: 8395152
    Abstract: A method is provided for growing a stable p-type ZnO thin film with low resistivity and high mobility. The method includes providing an n-type Li—Ni co-doped ZnO target in a chamber, providing a substrate in the chamber, and ablating the target to form the thin film on the substrate.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: March 12, 2013
    Assignee: Indian Institute of Technology Madras
    Inventors: M. S. Ramachandra Rao, E. Senthil Kumar
  • Patent number: 8383627
    Abstract: Crystalline Form IV of doxazosin mesylate, a process for its preparation and uses thereof.
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: February 26, 2013
    Assignee: CIPLA Limited
    Inventors: Rajendra Narayanrao Kankan, Dharmaraj Ramachandra Rao, Manish Gopaldas Gangrade, Shrikant Suresh Mudgal
  • Patent number: 8380188
    Abstract: A wireless handset, system and method is described that enables a wireless handset having access to an international long distance service to provide another wireless handset with temporary or limited international long distance service. The wireless handset comprises a transceiver, a user interface, a service request, and a first service acknowledgement. The transceiver communicates with a wireless network managed by a wireless network service provider that controls the first service. The wireless network communicates with the wireless handset and a separate wireless handset that does not have access to the first service. The user interface enables the separate wireless handset to have temporary access to the first service. The service request communicated from the wireless handset requests the separate wireless handset have temporary access to the first service. The first service acknowledgement acknowledges the separate wireless handset has temporary access to the first service.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: February 19, 2013
    Assignee: KYOCERA Corporation
    Inventors: Padmaja Ramachandra Rao, Rama Moorthy Kuvethanda, Diego Kaplan
  • Publication number: 20130029945
    Abstract: There is disclosed crystalline darunavir hydrate substantially free of any non-aqueous solvent.
    Type: Application
    Filed: October 6, 2010
    Publication date: January 31, 2013
    Applicant: CIPLA LIMITED
    Inventors: Manjinder Singh Phull, Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan
  • Publication number: 20130018674
    Abstract: A method and system for managing radiology study orders is disclosed. The method includes the steps for creating an order for a radiology study; receiving one or more images; reconciling an image from one or more images with the order, based on a reconciliation rule set to obtain the radiology study; assigning a radiologist for the radiology study based on auto-scheduling rule set and control parameters; reading of the radiology study by the radiologist; recording of a radiology report for the radiology study by the radiologist; generating a quality index for the radiologist based on the radiology report; sending the radiology report to a physician; and approving of the radiology report by the physician.
    Type: Application
    Filed: February 15, 2011
    Publication date: January 17, 2013
    Inventors: Ricky Bedi, Raghavendra Ramachandra Rao, Raghavendra Kumar Ravinutala, Vijay Pandurangan, Karthikeyan Subbaraj
  • Patent number: 8350031
    Abstract: The present invention provides a compound of formula (IV) wherein R is Cl, Br, NO2, OH or OR?, and R? is alkyl, and its use in the synthesis of levocetirizine, including its use in the synthesis of (?)-1-[(4-chlorophenyl)-phenylmethyl]piperazine, an intermediate useful in the synthesis of levocetirizine. The present invention also provides compounds (II) and (III) which are useful in the synthesis of compound (IV).
    Type: Grant
    Filed: June 2, 2009
    Date of Patent: January 8, 2013
    Assignee: CIPLA Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Maruti Ghagare, Sandip Vasant Chikhalikar
  • Patent number: 8349863
    Abstract: The invention relates to a novel crystalline form of topotecan hydrochloride, and methods of making the same. The characteristic XRPD pattern and FT-IT patterns are shown in FIGS. 1 and 2.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: January 8, 2013
    Assignee: Cipla Limited
    Inventors: Srinivas Laxminarayan Pathi, Shashi Rekha Kanathala, Manish Gopaldas Gangrade, Rajendra Narayanrao Kankan, Dharmaraj Ramachandra Rao
  • Patent number: 8350029
    Abstract: There is provided a compound of formula III, and a process for preparing a compound of formula V comprising converting a compound of formula III to the compound V, wherein X is fluoro, chloro, bromo or iodo. There is also provided a process for preparing a compound of formula XI comprising converting a compound of formula X to the compound XI. The compounds V and XI so prepared may be used in a process for preparing gefitinib.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: January 8, 2013
    Assignee: CIPLA Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Srinivas Laxminarayan Pathi
  • Patent number: 8344149
    Abstract: Crystalline raloxifene hydrochloride in hydrated form, particularly the monohydrate, processes for its preparation, pharmaceutical compositions comprising it and uses thereof.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: January 1, 2013
    Assignee: Cipla Limited
    Inventors: Srinivas Laxminarayan Pathi, Rajendra Narayanrao Kankan, Dharmaraj Ramachandra Rao
  • Patent number: 8324381
    Abstract: A process for the preparation of valganciclovir with triacetyl ganciclovir (V) as a starting material, comprising the following steps: selective hydrolysis, reacting with a coupling agent and CBZ valine and a solvent, followed by hydrolysis under basic conditions and hydrogenolysis in the presence of a catalyst.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: December 4, 2012
    Assignee: CIPLA Limited
    Inventors: Dharmaraj Ramachandra Rao, Rajendra Narayanrao Kankan, Vidyadhar Purushottam Pande
  • Patent number: 8288561
    Abstract: An N-[(2?-(1-triphenyl methyl tetrazole-5-yl)biphenyl]-4-yl]methyl]-L-valine benzyl ester organic salt of formula (IVA) wherein A represents an organic carboxylic acid, a process for its preparation and its use in the synthesis of valsartan or salts thereof.
    Type: Grant
    Filed: May 7, 2008
    Date of Patent: October 16, 2012
    Assignee: CIPLA Limited
    Inventors: Rajendra Narayanrao Kankan, Dharmaraj Ramachandra Rao, Srinivas Laxminarayan Pathi, Ravikumar Puppala
  • Patent number: RE43844
    Abstract: A process for making optically pure (R) and (S) salbutamol comprises obtaining the (R) or (S) isomer of either salbutamol or a salbutamol precursor in substantially optically pure form by resolving a racemic or optically impure mixture of enantiomers of salbutamol or of said precursor with either (L) or (D) tartaric acid, and where necessary converting said isomer of said precursor into either (R or (S) salbutamol respectively; then optionally converting said optically pure (R) and/or (S) salbutamol into a pharmaceutically acceptable salt.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: December 4, 2012
    Assignee: Cipla Limited
    Inventors: Yusuf Khwaja Hamied, Rajendra Narayanrao Kankan, Dharmaraj Ramachandra Rao
  • Patent number: RE43984
    Abstract: A process for making optically Optically pure (R) and (S) salbutamol comprises obtaining the (R) or (S) isomer of either salbutamol or a salbutamol precursor in substantially optically pure form is obtained by resolving a racemic or optically impure mixture of enantiomers of salbutamol or of said a salbutamol precursor with either (L) or (D) tartaric acid, and where necessary converting said isomer of said precursor into either (R) or (S) salbutamol respectively; then optionally converting said optically pure (R) and/or (S) salbutamol into a pharmaceutically acceptable salt.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: February 5, 2013
    Assignee: Cipla Limited
    Inventors: Yusuf Khwaja Hamied, Rajendra Narayanrao Kankan, Dharmaraj Ramachandra Rao