Patents by Inventor Bhabatosh Bhattacharya

Bhabatosh 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).

  • Use of ring-brominated benzoate compounds as flame retardants and/or plasticizers
    Patent number: 5728760
    Abstract: A method of making flame retarded polyurethanes by including a bromobenzoate compound in the polyurethane mixture. Also disclosed is a method of making flame retarded polyvinyl chlorides, unsaturated polyesters and epoxy resins by incorporating a bromobenzoate compound into the polymer system. The bromobenzoate compounds of the invention may also be used as plasticizers for PVC and rubber.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: March 17, 1998
    Assignee: Great Lakes Chemical Corporation
    Inventors: Richard S. Rose, Bhabatosh Bhattacharya, Nicolai A. Favstritsky
  • One-pot synthesis of ring-brominated benzoate compounds
    Patent number: 5637757
    Abstract: A method of preparing tetrabromobenzoate compounds from tetrabromophthalic anhydride by reacting tetrabromophthalic anhydride with alcohol in the presence of a decarboxylation catalyst. The reaction may be carried out in an excess of alcohol, or with a near stoichiometric amount of alcohol by performing the reaction in an inert solvent.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: June 10, 1997
    Assignee: Great Lakes Chemical Corporation
    Inventors: John E. Hill, Nicolai A. Favstritsky, Rastko I. Mamuzic, Bhabatosh Bhattacharya
  • Isolation of partially brominated diphenyl ether mixtures in crystalline form with higher melting range
    Patent number: 5352844
    Abstract: This invention relates to a process for isolation of partially brominated diphenyl ether mixtures ("Octabrom") having an average bromine content of 7.2-8.5. The process comprises: (i) adding a C.sub.1 -C.sub.4 alkanol to the Octabrom in solution in an organic solvent; (ii) maintaining the contact of the alkanol with Octabrom in the organic solvent for that period of time which is sufficient to allow the Octabrom to precipitate in crystalline form, making a slurry; and (iii) recovering the final Octabrom from the slurry.
    Type: Grant
    Filed: January 27, 1994
    Date of Patent: October 4, 1994
    Assignee: Great Lakes Chemical Corporation
    Inventors: Bhabatosh Bhattacharya, Wayne C. Muench
  • Process for producing 4,4'-dibromodiphenyl ether
    Patent number: 4835322
    Abstract: 4,4'-dibromodiphenyl ether may be obtained in high yield and purity by the uncatalyzed "neat" bromination of diphenyl oxide, followed by methanol digestion.
    Type: Grant
    Filed: October 19, 1987
    Date of Patent: May 30, 1989
    Assignee: Great Lakes Chemical Corporation
    Inventors: Rastko I. Mamuzic, Bhabatosh Bhattacharya
  • Process for preparing alkyl tetrabromophthalates
    Patent number: 4754053
    Abstract: Bis(2-ethyl-1-hexyl) tetrabromophthalate produced by the reaction of tetrabromophthalic anhydride with 2-ethyl-1-hexanol in the presence of titanium isopropoxide catalyst may be purified by contacting the reaction mixture with sodium carbonate decahydrate with agitation for a time and at a temperature sufficient to enhance product quality, followed by isolation of bis(2-ethyl-1-hexyl) tetrabromophthalate.
    Type: Grant
    Filed: May 12, 1987
    Date of Patent: June 28, 1988
    Assignee: Great Lakes Chemical Corporation
    Inventors: Rastko I. Mamuzic, Bhabatosh Bhattacharya