Patents by Inventor Shallendra Kumar Singh

Shallendra Kumar Singh 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 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