Patents by Inventor Apurba Bhattacharya

Apurba Bhattacharya 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).

  • Amphoteric copolymer derived from vinylpyridine and acetoxystyrene
    Patent number: 5210149
    Abstract: A unique polymer was synthesized via copolymerization of vinylpyridine and acetoxystyrene under radical-initiated conditions followed by acidic or basic hydrolysis of the acetoxy group to afford the corresponding hydroxy group. The built-in acid-base dual functionality (phenolic and pyridyl units) in this polymer backbone gives rise to its unique solubility properties over a wide pH range in both aqueous and non-aqueous media. Due to its amphoteric nature, this polymer finds application as an anti-stat, viscosity modifier, and/or ion-exchange resin.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: May 11, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Apurba Bhattacharya, Kenneth G. Davenport, Michael T. Sheehan, James R. Sounik
  • Dehydrogenation process intermediates
    Patent number: 5116983
    Abstract: A process for dehydrogenating a compound of the formula ##STR1## which comprises reacting the compound with a silylating agent in the presence of a quinone to introduce a .DELTA..sup.1 double bond.
    Type: Grant
    Filed: May 8, 1990
    Date of Patent: May 26, 1992
    Assignee: Merck & Co., Inc.
    Inventors: Apurba Bhattacharya, Alan W. Douglas, Edward J. Grabowski, Ulf H. Dolling
  • Dehydrogenation process
    Patent number: 5084574
    Abstract: A process for dehydrogenating a compound of the formula ##STR1## which comprises reacting the compound with a silylating agent in the presence of a quinone to introduce a .DELTA..sup.1 double bond.
    Type: Grant
    Filed: February 7, 1990
    Date of Patent: January 28, 1992
    Assignee: Merck & Co., Inc.
    Inventors: Apurba Bhattacharya, Alan W. Douglas, Edward J. Grabowski, Ulf H. Dolling
  • Preparation of an enantiomer of a substituted fluorenyloxyacetic acid
    Patent number: 4605760
    Abstract: A process for direct preparation of an enantiomer of a substituted fluorenyloxyacetic acid is disclosed. The acetic acid derivative is useful for treating brain edema.
    Type: Grant
    Filed: August 16, 1985
    Date of Patent: August 12, 1986
    Assignee: Merck & Co., Inc.
    Inventor: Apurba Bhattacharya
  • Preparation of enantiomers of a substituted fluorenyloxyacetic acid
    Patent number: 4587357
    Abstract: A process for direct preparation of enantiomers of a substituted fluorenyloxyacetic acid is disclosed. The acetic acid derivative is useful for treating brain edema.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: May 6, 1986
    Assignee: Merck & Co., Inc.
    Inventor: Apurba Bhattacharya