Patents by Inventor Pranab Haldar

Pranab Haldar 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 preparation of pure linagliptin
    Patent number: 9056112
    Abstract: The present application provides a process for preparation of Linagliptin reacting (R)-piperidine-3-amine of Formula II or an acid addition salt thereof with 1-[(4-methyl-quinazolin-2-yl)methyl]-3-methyl-7-(2-butyn-1-yl)-8-bromoxanthine of Formula III in the presence of a suitable base in an inert organic solvent.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: June 16, 2015
    Assignee: DR. REDDY'S LABORATORIES LIMITED
    Inventors: Pranab Haldar, Venkateswarlu Muvva, Anil Kumar Prataprao, Vijaya Kumar Karri, Bhanu Pratap Taduri, Venkateshwara Natraj Birudaraju
  • PROCESS FOR PREPARATION OF PURE LINAGLIPTIN
    Publication number: 20140357863
    Abstract: The present application provides a process for preparation of Linagliptin reacting (R)-piperidine-3-amine of Formula II or an acid addition salt thereof with 1-[(4-methyl-quinazolin-2-yl)methyl]-3-methyl-7-(2-butyn-1-yl)-8-bromoxanthine of Formula III in the presence of a suitable base in an inert organic solvent.
    Type: Application
    Filed: December 27, 2012
    Publication date: December 4, 2014
    Inventors: Pranab Haldar, Venkateswarlu Muvva, Anil Kumar Prataprao, Vijaya Kumar Karri, Bhanu Pratap Taduri, Venkateshwara Natraj Birudaraju
  • PREPARATION OF NEBIVOLOL
    Publication number: 20110250454
    Abstract: Processes for the synthesis of pharmacologically active 2,2-iminobisethanol derivatives, e.g., 2H-1-benzopyran-2 methanol-?,??-iminobis(methylene)]bis-[6-fluoro-3,4-dihydro-[2R*[R*[R*(S*)]]]], and their pharmaceutically acceptable salts.
    Type: Application
    Filed: April 8, 2011
    Publication date: October 13, 2011
    Inventors: Pranab Haldar, China Malakondaiah Golla, Akula Swapna, Karri Vijaya Kumar, Suhas Jawlekar, Arjun Kumar Tummala, Deepali Patro, Sesha Reddy Yarraguntla, Srividya Ramakrishnan, Venkata Ramana Reddy Chimala