Patents by Inventor Rajesh Prasad Nautiyal

Rajesh Prasad Nautiyal 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 letrozole and its intermediates
    Patent number: 8198460
    Abstract: The present invention relates to an improved process for preparation of the non-steroidal aromatase inhibitor drug, Letrozole of formula (I) and its intermediates, 4-[1-(1,2,4-triazolyl)methyl]-benzonitrile of formula (IV) and 4-[1-(1,2,4-triazolyl)methyl]-benzonitrile hydrochloride of formula (VII), all having a purity of ?99%, which is simple, convenient, economical, does not use hazardous chemicals and industrially viable.
    Type: Grant
    Filed: January 16, 2008
    Date of Patent: June 12, 2012
    Assignee: Fresenius Kabi Oncology Ltd.
    Inventors: Vimal Kumar Shrawat, Jai Pal Singh, Rajesh Prasad Nautiyal
  • PROCESS FOR PREPARATION OF LETROZOLE AND ITS INTERMEDIATES
    Publication number: 20100234617
    Abstract: The present invention relates to an improved process for preparation of the non-steroidal aromatase inhibitor drug, Letrozole of formula (I) and its intermediates, 4-[1-(1,2,4-triazolyl)methyl]-benzonitrile of formula (IV) and 4-[1-(1,2,4-triazolyl)methyl]-benzonitrile hydrochloride of formula (VII), all having a purity of ?99%, which is simple, convenient, economical, does not use hazardous chemicals and industrially viable.
    Type: Application
    Filed: January 16, 2008
    Publication date: September 16, 2010
    Applicant: FRESENIUS KABI ONCOLOGY LTD.
    Inventors: Vimal Kumar Shrawat, Jai Pal Singh, Rajesh Prasad Nautiyal