Patents by Inventor Chandrashekar S. Shetty

Chandrashekar S. Shetty 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).

  • Hydrophobically modified polymers for sludge dewatering
    Patent number: 5601725
    Abstract: A method for the dewatering of sludges in industrial waste waters utilizing a hydrophobically-modified coagulant copolymer of diallyldimethyl ammonium chloride and quaternized dimethylaminoethyl acrylate or quaternized dimethylaminoethylmethacrylate and a flocculant.
    Type: Grant
    Filed: October 23, 1995
    Date of Patent: February 11, 1997
    Assignee: Nalco Chemical Company
    Inventors: Daniel K. Chung, Chandrashekar S. Shetty, Manian Ramesh
  • Silicon polyelectrolytes for pitch deposit control
    Patent number: 5527431
    Abstract: A method for controlling pitch in papermaking systems which comprises the step of adding a water-soluble, silicon-containing polyelectrolyte copolymer coagulant to pulp and paper process water. The water-soluble, silicon-containing polyelectrolyte copolymer coagulant preferably comprises diallyldimethyl ammonium chloride and a vinyl alkoxysilane.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 18, 1996
    Assignee: Nalco Chemical Company
    Inventors: Chandrashekar S. Shetty, Manian Ramesh
  • Vinyl alkoxysilane copolymer polyelectrolytes for pitch deposit control
    Patent number: 5510439
    Abstract: A method for controlling pitch in papermaking systems which comprises the step of adding a hydrophobic polyelectrolyte copolymer coagulant to pulp and paper process water. The hydrophobic polyelectrolyte copolymer coagulant preferably comprises a first monomer selected from the group of hydrophilic monomers and hydrophobic monomers, and a vinyl siloxane monomer.
    Type: Grant
    Filed: November 4, 1993
    Date of Patent: April 23, 1996
    Assignee: Nalco Chemical Company
    Inventors: Chandrashekar S. Shetty, Manian Ramesh
  • Method of removing color from waste water using an aqueous dispersion polymer
    Patent number: 5435922
    Abstract: A method for removing color from a paper mill waste effluent which comprises the step of adding a low molecular weight hydrophobic polymer dispersion to the effluent. The hydrophobic dispersion is preferably formed from the precipitation polymerization of at least one hydrophilic monomer and a hydrophobic monomer in the presence of a precipitation aid, water, a chain transfer agent, and an initiator.
    Type: Grant
    Filed: June 14, 1993
    Date of Patent: July 25, 1995
    Assignee: Nalco Chemical Company
    Inventors: Manian Ramesh, Chandrashekar S. Shetty
  • Polymers for treatment of food processing wastes
    Patent number: 5429749
    Abstract: A method for conditioning food processing waste prior to chemical dewatering comprising the step of treating the food processing waste with an effective amount of at least one hydrophobic polymer coagulant.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: July 4, 1995
    Assignee: Nalco Chemical Company
    Inventors: Daniel K. Chung, Manian Ramesh, Chandrashekar S. Shetty
  • Hydrophobic polyelectrolytes used in removing color
    Patent number: 5338816
    Abstract: A hydrophobic polyelectrolyte copolymer which is useful in the removal of color in paper mill waste water. The copolymer preferably comprises diallyldimethylammonium chloride and a hydrophobic monomer selected from the group consisting of quaternized dimethylaminoethylacrylates and quaternized dimethylaminoethylmethacrylates.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: August 16, 1994
    Assignee: Nalco Chemical Company
    Inventors: Manian Ramesh, John W. Sparapany, Martha R. Finck, Kristine S. Siefert, Chandrashekar S. Shetty
  • Hydrophobic polyelectrolytes used in color removal
    Patent number: 5314627
    Abstract: A hydrophobic polyelectrolyte copolymer which is useful in the removal of color in paper mill waste water. The copolymer preferably comprises an acrylamide and a hydrophobic monomer selected from the group consisting of quaternized dimethylaminoethylacrylates and quaternized dimethylaminoethylmethacrylates.
    Type: Grant
    Filed: September 13, 1993
    Date of Patent: May 24, 1994
    Assignee: Nalco Chemical Company
    Inventors: Manian Ramesh, Chandrashekar S. Shetty, Martha R. Finck
  • Hydrophobic polyelectrolytes used in color removal
    Patent number: 5292793
    Abstract: A hydrophobic polyelectrolyte copolymer which is useful in the removal of color in paper mill waste water. The copolymer preferably comprises an acrylamide and a hydrophobic monomer selected from the group consisting of quaternized dimethylaminoethylacrylates and quaternized dimethylaminoethylmethacrylates.
    Type: Grant
    Filed: July 14, 1992
    Date of Patent: March 8, 1994
    Assignee: Nalco Chemical Company
    Inventors: Manian Ramesh, Chandrashekar S. Shetty, Martha R. Finck
  • Hydrophobic polyelectrolytes used in removing color
    Patent number: 5283306
    Abstract: A hydrophobic polyelectrolyte copolymer which is useful in the removal of color in paper mill waste water. The copolymer preferably comprises diallyldimethylammonium chloride and a hydrophobic monomer selected from the group consisting of quaternized dimethylaminoethylacrylates and quaternized dimethylaminoethylmethacrylates.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: February 1, 1994
    Assignee: Nalco Chemical Company
    Inventors: Manian Ramesh, John W. Sparapany, Martha R. Finck, Kristine S. Siefert, Chandrashekar S. Shetty
  • Anionic and nonionic solution polymers for paint detackification
    Patent number: 5215668
    Abstract: 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: Grant
    Filed: July 31, 1991
    Date of Patent: June 1, 1993
    Assignee: Nalco Chemical Company
    Inventors: Bhupati R. Bhattacharyya, deceased, Shu-Jen W. Huang, Chandrashekar S. Shetty, Nang T. Bui, Yvonne O. Dunn
  • Pulp waste color removal with diallyl dimethyl ammonium chloride copolymers
    Patent number: 5209854
    Abstract: Diallyl dimethyl ammonium chloride copolymers are effective in removing color from paper mill wastes when anionic vinyl monomers are used as the co-monomers.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: May 11, 1993
    Assignee: Nalco Chemical Company
    Inventors: Peter E. Reed, Chandrashekar S. Shetty, Martha R. Finck
  • Pulp and paper mill wastewater color removal
    Patent number: 5200089
    Abstract: The invention provides a method for decolorizing an effluent stream from a pulp mill plant comprising the step of adding an effective amount of a decolorizing composition including a ferrous sulfate and a water-soluble cationic amine polymer.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: April 6, 1993
    Assignee: Nalco Chemical Company
    Inventors: Kristine S. Siefert, Manian Ramesh, Martha R. Finck, Chandrashekar S. Shetty
  • Method for detackifying oversprayed paint
    Patent number: 5192449
    Abstract: 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: Grant
    Filed: April 17, 1992
    Date of Patent: March 9, 1993
    Assignee: Nalco Chemical Company
    Inventors: Shu-Jen W. Huang, Chandrashekar S. Shetty, Nang T. Bui, Yvonne O. Dunn, Uma Bhattacharyya, Bhupati R. Bhattacharyya
  • Method for detackifying oversprayed paint
    Patent number: 5116514
    Abstract: 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: Grant
    Filed: April 8, 1991
    Date of Patent: May 26, 1992
    Assignee: Nalco Chemical Company
    Inventors: Bhupati R. Bhattacharyya, deceased, Shu-Jen Huang, Chandrashekar S. Shetty, Nang T. Bui, Yvonne O. Dunn