Patents by Inventor Krishnarao Tukaram Sirsath

Krishnarao Tukaram Sirsath 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 7-[?-amino (4-hydroxyphenyl) acetamido]-3-substituted-3-cephem-4-carboxylic acid
    Patent number: 7427692
    Abstract: A process for preparation of 7-[D-?-amino-?-(4-hydroxyphenyl)acetamido]-3-(1-propen-1-yl)-3-cephem-4-carboxylic acid viz. Cefprozil of formula (I) in high purity, substantially free of impurities, which comprises preparation of mixed acid anhydride by selecting the sequence and temperature of addition of the reagents and its subsequent condensation with a protected 7-APCA; followed by hydrolysis, isolation and purification to give Cefprozil of formula (I) in the form of a monohydrate.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: September 23, 2008
    Assignee: Lupin Ltd.
    Inventors: Om Dutt Tyagi, Dnyandev Ragho Rane, Tushar Kumar Srivastava, Krishnarao Tukaram Sirsath
  • Process for preparation of 7-[?-Amino (4-hydroxyphenyl) acetamido]-3-substituted-3-cephem-4-carboxylic acid
    Patent number: 7230097
    Abstract: A process for preparation of 7-[D-?-amino-?-(4-hydroxyphenyl)acetamido]-3-(1-propen-1-yl)-3-cephem-4-carboxylic acid viz. Cefprozil of formula (I) in high purity, substantially free of impurities, which comprises preparation of mixed acid anhydride by selecting the sequence and temperature of addition of the reagents and its subsequent condensation with a protected 7-APCA; followed by hydrolysis, isolation and purification to give Cefprozil of formula (I) in the form of a monohydrate.
    Type: Grant
    Filed: March 15, 2004
    Date of Patent: June 12, 2007
    Assignee: Lupin Ltd.
    Inventors: Om Dutt Tyagi, Dnyandev Ragho Rane, Tushar Kumar Srivastava, Krishnarao Tukaram Sirsath