Patents by Inventor Ashoke Kumar

Ashoke Kumar 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).

  • Regiospecific process for synthesis of acyclic nucleosides
    Patent number: 6043364
    Abstract: N-7 isomer of the formula ##STR1## is converted into a N-9 isomer of the formula ##STR2## by heating a suspension of the N-7 isomer in an alkylating agent of the formula ##STR3##
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: March 28, 2000
    Assignee: Lupin Laboratories Limited
    Inventors: Ashoke Kumar, Dharmendra Singh, Mukesh Jagannath Wani, Narendra Sriram Joshi, Pravin Sahadev Thombre, Ajay Singh Rawat
  • Regiospecific process for synthesis of acyclic nucleosides
    Patent number: 5821367
    Abstract: This invention relates to an improved regiospecific process for the synthesis of acyclic nucleosides such as, acyclovir and ganciclovir, anti-viral compounds especially effective against herpes virus, and intermediates thereof starting from dyacylguanine and an alkylating agent, selected from 2-oxa-1,4-butanediol diacetate (OBDDA), 1,4-diacetoxy-3-acetoxymethyl-2-oxa-butane, 1,4-dibenzyloxy-3-acetoxymethyl-2-oxabutane. The reaction is carried out in the absence of an acid catalyst and a solvent.
    Type: Grant
    Filed: April 5, 1996
    Date of Patent: October 13, 1998
    Assignee: Lupin Laboratories Limited
    Inventors: Ashoke Kumar, Dharmendra Singh, Mukesh Jagannath Wani, Narendra Sriram Joshi, Pravin Sahadev Thombre, Ajay Singh Rawat