Patents by Inventor Bhupati R. Bhattacharyya
Bhupati R. Bhattacharyya 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).
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Patent number: 5215668Abstract: Oversprayed paint in a paint spray operation is detackified by dosing the water of the waste water system of such operation with a composition comprising an amphoteric polymer and aluminum salts. The amphoteric polymer contains at least about 10 mole percent of cationic mer units of monoethylenically unsaturated monomer and at least 1 mole percent of anionic mer units. The aluminum salt preferred is aluminum sulfate, or its hydrates, for example alum. The amphoteric polymers preferably contain DMAEM, DMAEM.multidot.H.sub.2 SO.sub.4, DMAEM.multidot.MCQ, or mixtures thereof, with acrylic acid, methacrylic acid, AMPS, or mixtures thereof. The amphoteric polymers may also contain neutral monomers such as (meth)acrylamide.Type: GrantFiled: July 31, 1991Date of Patent: June 1, 1993Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, deceased, Shu-Jen W. Huang, Chandrashekar S. Shetty, Nang T. Bui, Yvonne O. Dunn
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Patent number: 5192449Abstract: Oversprayed paint in a paint spray operation is detackified by dosing the water of the waste water system of such operation with a composition comprising a polymer and aluminum sulfate. The polymer contains at least about 10 mole percent of cationic mer units of monoethylenically unsaturated monomer.Type: GrantFiled: April 17, 1992Date of Patent: March 9, 1993Assignee: Nalco Chemical CompanyInventors: Shu-Jen W. Huang, Chandrashekar S. Shetty, Nang T. Bui, Yvonne O. Dunn, Uma Bhattacharyya, Bhupati R. Bhattacharyya
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Patent number: 5137641Abstract: Water-in-oil emulsion polymers of cationic acrylamides to which are added small quantities of chain transfer agents. These polymers are useful as flocculants in sludge dewatering processes.Type: GrantFiled: March 4, 1991Date of Patent: August 11, 1992Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, John W. Sparapany
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Patent number: 5116514Abstract: Oversprayed paint in a paint spray operation is detackified by dosing the water of the waste water system of such operation with a composition comprising a polymer and aluminum sulfate. The polymer contains at least about 10 mole percent of cationic mer units of monoethylenically unsaturated monomer.Type: GrantFiled: April 8, 1991Date of Patent: May 26, 1992Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, deceased, Shu-Jen Huang, Chandrashekar S. Shetty, Nang T. Bui, Yvonne O. Dunn
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Patent number: 5100582Abstract: An emulsion polymer having activity as a demulsifier for a w/o emulsion, particularly water-in-crude oil, having the general formula ##STR1##Type: GrantFiled: December 28, 1989Date of Patent: March 31, 1992Assignee: Nalco Chemical CompanyInventor: Bhupati R. Bhattacharyya
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Patent number: 5093413Abstract: Water-in-oil emulsion polymers of cationic acrylamides to which are added small quantities of a hydroxyalkyl methacrylate and sodium formate. These polymers are useful as flocculants in sludge dewatering processes.Type: GrantFiled: March 4, 1991Date of Patent: March 3, 1992Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, deceased, John W. Sparapany, Yvonne O. Dunn, Foster Michael H.
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Patent number: 5068297Abstract: Hydrophobic cationic terpolymers of monomers of (a) acrylamide and/or methacrylamide, (b) dimethylaminoethylmethacrylate methyl chloride and/or dimethylaminoethylmethacrylate methyl sulfate, and (c) vinyl acetate; water-in-oil and oil-in-water emulsions containing said terpolymers; and dewatering of wastes and sludges utilizing said oil-in-water emulsions in which the terpolymers are present essentially in the aqueous phase.Type: GrantFiled: October 26, 1989Date of Patent: November 26, 1991Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, Michael R. St. John
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Patent number: 5051487Abstract: Hydrophobic cationic terpolymers resulting from the polymerization of a mixture of monomers of (a) acrylamide and/or methacrylamide, (b) dimethylaminoethylacrylate methyl chloride and/or dimethylaminoethylacrylate methyl sulfate, and (c) vinyl acetate; water-in-oil and oil-in-water emulsions containing said terpolymers; and dewatering of wastes and sludges utilizing said oil-in-water emulsions in which the terpolymers are present essentially in the aqueous phase.Type: GrantFiled: March 20, 1989Date of Patent: September 24, 1991Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, Michael R. St. John
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Patent number: 4806345Abstract: Personal care compositions are provided which have as a thickening agent a lightly cross-linked cationic vinyl addition polymer. Such compositions include water, at least one cosmetically-active agent, and such thickening agent, preferably one derived from the polymerization of a cationic vinyl addition monomer, acrylamide, and a small amount of a difunctional vinyl addition monomer for cross-linking purposes. Alternatively, the cross-linking functionality can be provided by the incorporation of an anionic vinyl addition monomer into the polymer.Type: GrantFiled: November 21, 1985Date of Patent: February 21, 1989Assignee: Nalco Chemical CompanyInventor: Bhupati R. Bhattacharyya
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Patent number: 4715962Abstract: A method of removing impurities from water which comprises treating these impurity-containing waters with a few parts per million of a water-soluble polymer containing a major portion of Diallyldimethyl Ammonium Chloride and ether.A. from 5 to 25 mole percent of either acrylic acid or methacrylic acid, or,B. from 5 to 25 mole percent of either acrylic acid or methacrylic acid and from 1-10 percent of a hydroxy C.sub.2 -C.sub.6 alkyl acrylate or methacrylate:which polymer is characterized as having an intrinsic viscosity of at least 0.5.Type: GrantFiled: August 15, 1986Date of Patent: December 29, 1987Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, Sanjay R. Srivatsa, Michael L. Dwyer
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Patent number: 4713431Abstract: High molecular weight DADMAC polymers are produced by polymerizing an inverse latex of DADMAC with 0.5 to 3 weight percent acrylamide. The polymerization uses a low HLB emulsifier and a free radical initiator.Type: GrantFiled: November 12, 1986Date of Patent: December 15, 1987Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, Philip D. Dalsin
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Patent number: 4673511Abstract: An improved method of dewatering mineral slurries which comprises treating said slurries with a dewatering amount of a copolymer of acrylamide and DADMAC, which polymers are characterized as containing from 3-50 mole percent of acrylamide and having a Reduced Specific Viscosity of at least 2.Type: GrantFiled: September 30, 1985Date of Patent: June 16, 1987Assignee: Nalco Chemical CompanyInventors: Paul F. Richardson, Bhupati R. Bhattacharyya
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Patent number: 4443576Abstract: Novel polymeric compositions useful as thickeners and rheology modifiers for oil-in-water emulsion systems are disclosed. The water-soluble or swellable compositions described contain, prior to polymerization, from:______________________________________ 10-70% Acrylamide or methacrylamide; 20-70% Acrylic acid, methacrylic acid, or their water-soluble salts; 5-50% Of a hydroxyalkylacrylate; 0-10% Of a polyfunctional monomeric branching material; and, 0-15% Low molecular weight water-soluble copolymer of a non-ionic or anionic water-soluble vinyl addition monomer and lower alkylacrylate. ______________________________________Optionally a water-soluble polymer dispersant may be added to the composition after polymerization.Type: GrantFiled: March 29, 1982Date of Patent: April 17, 1984Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, Manuel Slovinsky, Raymond J. Wachala, Lawrence E. Beske, Michael L. McCullar
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Patent number: 4420586Abstract: Non-aqueous dispersion polymers are formed using certain polymer oil-soluble oxygen containing solvents having at least two labile hydrogen atoms and at least one tertiary carbon atom. Non-aqueous dispersion polymers prepared in this manner do not require the use of block or graft copolymer stabilizers.Type: GrantFiled: November 29, 1982Date of Patent: December 13, 1983Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, Edward G. Ballweber
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Patent number: 4417992Abstract: Dust is controlled on roads, in mines, on mineral and tailings piles, surfaces of pulverized coal and mineral piles contained within open transit cars such as coal cars or trucks, and other surfaces containing coal particles, rock dust, clay, soil particles and other finely divided particles subject to dusting by applying thereto a dust inhibiting amount of a liquid dispersion of watery consistency of highly branched water swellable polymer of acrylamide or an acrylamide-acrylic acid copolymer, branched and/or cross-linked with a multifunctional unsaturated monomer containing more than one ethylenically unsaturated group, said cross-linked polyer or copolymer having a three-dimensional structure and being in the form of microgelatinous particles having a particle size not exceeding approximately one micron in an oil containing emulsion form, and having the properties of swelling dramatically in water and binding dust particles upon adsorption from solution.Type: GrantFiled: December 13, 1982Date of Patent: November 29, 1983Assignee: Nalco Chemical CompanyInventors: Bhupati R. Bhattacharyya, William J. Roe