Patents Represented by Attorney, Agent or Law Firm William D. Hare, Esq.
  • Process for the preparation of highly pure crystalline (R,S)—cefuroxime axetil
    Patent number: 6833452
    Abstract: A process for the preparation of highly pure crystalline form of cefuroxime-1-acetoxyethyl ester (cefuroxime axetil) from cefuroxime by reacting an amine salt of cefuroxime with an esterifying reagent.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: December 21, 2004
    Assignee: Ranbaxy Laboratories Limited
    Inventors: Om Dutt Tyagi, Gyan Chand Yadav, Vijay Kumar Handa
  • Process for the preparation of tolterodine
    Patent number: 6822119
    Abstract: The present invention relates to a cost effective and industrially advantageous process for the preparation of tolterodine and pharmaceutically acceptable salts thereof.
    Type: Grant
    Filed: May 18, 2004
    Date of Patent: November 23, 2004
    Assignee: Ranbaxy Laboratories Limited
    Inventors: Yatendra Kumar, Mohan Prasad, Praveen Kumar Neela, Satyananda Misra
  • Process for the synthesis of n-(5-methylnicontinoyl)-4 hydroxypiperidine, a key intermediate of rupatadine
    Patent number: 6803468
    Abstract: The present invention relates to an improved and industrially advantageous process for the preparation of N-(5-methylnicotinoyl)-4-hydroxypiperidine of Formula I, as shown in the accompanied drawings. This compound is a key intermediate for the synthesis of rupatadine, a potent dual antagonist of histamine and platelet-activating factor (PAF).
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: October 12, 2004
    Assignee: Ranbaxy Laboratories Limited
    Inventors: Yatendra Kumar, Mohan Prasad, Shallendra Kumar Singh
  • Synthesis of 3-ethoxy-4-ethoxycarbonyl phenyl acetic acid, a key acid synthon of repaglinide
    Patent number: 6686497
    Abstract: The present invention relates to a new and industrially advantageous process for the preparation of 3-ethoxy-4-ethoxy-carbonyl-phenyl acetic acid. This compound is a key intermediate for the synthesis of Repaglinide, an oral hypoglycemic agent.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: February 3, 2004
    Assignee: Banbaxy Laboratories Limited
    Inventors: Mohammad Salman, J. Suresh Babu, Purna C. Ray, Sujay Biswas, Naresh Kumar