Patents by Inventor Neera Tiwari

Neera Tiwari 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 preparation of pure meropenem trihydrate
    Patent number: 9000150
    Abstract: The present invention relates to a process for the preparation of pure meropenem trihydrate.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: April 7, 2015
    Assignee: Ranbaxy Laboratories Limited
    Inventors: Prashant Kumar Sharma, Bhupendra Vashishta, Shailendra K. Singh, Neera Tiwari, Subhash Dhar
  • PROCESS FOR THE PREPARATION OF PURE MEROPENEM TRIHYDRATE
    Publication number: 20130253184
    Abstract: The present invention relates to a process for the preparation of pure meropenem trihydrate.
    Type: Application
    Filed: October 21, 2011
    Publication date: September 26, 2013
    Applicant: Ranbaxy Laboratories Limited
    Inventors: Prashant Kumar Sharma, Bhupendra Vashishta, Shailendra K. Singh, Neera Tiwari, Subhash Dhar
  • Process for the preparation of sterile doripenem
    Patent number: 8445673
    Abstract: The present invention relates to a process for the preparation of sterile doripenem.
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: May 21, 2013
    Assignee: Ranbaxy Laboratories Limited
    Inventors: Vinod George, Hashim Nizar Poovanathil Nagoor Meeran, Neera Tiwari, Mohan Prasad
  • PROCESS FOR THE PREPARATION OF STERILE DORIPENEM
    Publication number: 20110082293
    Abstract: The present invention relates to a process for the preparation of sterile doripenem.
    Type: Application
    Filed: March 23, 2009
    Publication date: April 7, 2011
    Applicant: RANBAXY LABORATORIES LIMITED
    Inventors: Vinod George, Hashim Nizar Poovanathil Nagoor Meeran, Neera Tiwari, Mohan Prasad
  • E-rotamers of 3-hydroy cephem derivatives
    Patent number: 5631367
    Abstract: A process for the manufacture of 7-acylamino-3-hydroxy-cephem-4-carboxylate-1-oxide in E-rotamer form (Formula III), comprises reacting a 7-acylamino-3-exomethylenecepham-4-carboxylate-1-oxide with ozone in an inert organic solvent in the presence of a catalytic amount of an organic or inorganic base at a temperature ranging from about -80.degree. C. to about +20.degree. C. The E-rotamer (wherein the 3-hydroxy group is strongly hydrogen bonded to the carbonyl of the 4-ester group) exhibits different chemical and physical properties from and is more thermodynamically stable than, the Z-rotamer (wherein there is no hydrogen bonding between the 3-hydroxy group and the carbonyl of the 4-ester group).
    Type: Grant
    Filed: March 10, 1995
    Date of Patent: May 20, 1997
    Inventors: Jag M. Khanna, Yatendra Kumar, Arun Malhotra, Rakesh Arora, Neera Tiwari
  • Process for P-nitrobenzyl ester cleavage in cephalosporin
    Patent number: 5536830
    Abstract: A process for converting cephalosporin p-nitrobenzyl ester (Formula I) to the corresponding cephalosporin free acid (Formula II) comprising treating the cephalosporin p-nitrobenzyl ester with a metal selected from the group consisting of iron, magnesium, aluminum, and tin, and with hydrochloric acid in a mixture of water and a water-miscible organic solvent. Preferably, the metal is iron in the form of a fine powder, and the reaction is carried out at a temperature in the range of 30.degree.-50.degree. C.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: July 16, 1996
    Assignee: Ranbaxy Laboratories, Ltd.
    Inventors: Jag M. Khanna, Yatendra Kumar, Rakesh K. Arora, Neera Tiwari, Shailendra K. Singh
  • Process for preparing Z and E-rotamers of 3-hydroxy cephem derivatives
    Patent number: 5410044
    Abstract: A process for the manufacture of 7-acylamino-3-hydroxycephem-4-carboxylate-1-oxide in E-rotamer form (Formula III), comprises reacting a 7-acylamino-3-exomethylenecepham-4-carboxylate-1-oxide with ozone in an inert organic solvent in the presence of a catalytic amount of an organic or inorganic base at a temperature ranging from about -80.degree. C. to about +20.degree. C. The E-rotamer (wherein the 3-hydroxy group is strongly hydrogen bonded to the carbonyl of the 4-ester group) exhibits different chemical and physical properties from and is more thermodynamically stable than, the Z-rotamer (wherein there is no hydrogen bonding between the 3-hydroxy group and the carbonyl of the 4-ester group).
    Type: Grant
    Filed: February 18, 1993
    Date of Patent: April 25, 1995
    Assignee: Ranbaxy Laboratories, Ltd.
    Inventors: Jag M. Khanna, Yatendra Kumar, Arun Malhotra, Rakesh Arora, Neera Tiwari