Patents by Inventor Prakash Rai

Prakash Rai 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).

  • Method for manufacture of cephalosporin and intermediates thereof
    Patent number: 5856502
    Abstract: This invention relates to reactive derivatives of 2-(2-aminothiazol-4-yl)-2-methoxyimino acetic acid and 1H-tetrazol-1-acetic acid of the following general formula I, ##STR1## wherein ##STR2## as well as to use thereof in the manufacture of cephalosporin antibiotics such as cefotaxime, ceftriaxone and cefazolin.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: January 5, 1999
    Assignee: Lupin Laboratories Limited
    Inventors: Debashish Datta, Vinod George, Bishwa Prakash Rai
  • Process for manufacture of cephalosporin such as ceftazidime and intermediate thereof
    Patent number: 5831085
    Abstract: This invention relates to reactive derivative of 2-(2-amino-4-thiazolyl)-(Z)-2-?(1-tert butoxycarbonyl-l-methylethoxy) imino!acetic acid of the following formula I ##STR1## as well as to the use thereof in the manufacture of cephalosporin antibiotic such as ceftazidime of formula II.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: November 3, 1998
    Assignee: Lupin Laboratories Limited
    Inventors: Debashish Datta, Bishwa Prakash Rai, Kishor Mehre
  • Dimethyl formiminium chloride chlorosulphate derivatives useful as intermediates for producing cephalosporins
    Patent number: 5739346
    Abstract: This invention relates to reactive derivatives of 2-(2-aminothiazol-4-yl)-2-methoxyimino acetic acid and 1H-tetrazol-1-acetic acid of the following general formula I, ##STR1## wherein R.sub.3 = ##STR2## as well as to use thereof in the manufacture of cephalosporin antibiotics such as cefotaxime, ceftriaxone and cefazolin.
    Type: Grant
    Filed: March 26, 1996
    Date of Patent: April 14, 1998
    Assignee: Lupin Laboratories Limited
    Inventors: Debashish Datta, Vinod George, Bishwa Prakash Rai