Patents by Inventor Sridhar Gopalkrishnan

Sridhar Gopalkrishnan 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).

  • Patent number: 10125049
    Abstract: A slurry for manufacturing gypsum board comprises calcined gypsum, water, a foaming agent, and a coalescing agent. The foaming agent imparts a plurality of bubbles in the slurry. Typically, a foam is pre-generated with the foaming agent and the foam is used to form the slurry such that the foam imparts the plurality of bubbles in the slurry. The coalescing agent coalesces the plurality of bubbles imparted by the foam. Typically, the coalescing agent coalesces a plurality of small and partially joined bubbles imparted by the foam to create larger and more discrete bubbles. A gypsum board and method of forming the slurry and the gypsum board are also disclosed. The gypsum board comprises a gypsum layer formed from the slurry. The gypsum layer defines a plurality of bubbles dispersed therein, which are imparted by the foam and coalescing agent of the slurry.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: November 13, 2018
    Assignees: BASF SE, NATIONAL GYPSUM PROPERTIES
    Inventors: Ronald A. Lee, David T. Durocher, Sridhar Gopalkrishnan Iyer, Richard J. Romanek, Eli Stav, Karen Fey
  • Publication number: 20160009598
    Abstract: A slurry for manufacturing gypsum board comprises calcined gypsum, water, a foaming agent, and a coalescing agent. The foaming agent imparts a plurality of bubbles in the slurry. Typically, a foam is pre-generated with the foaming agent and the foam is used to form the slurry such that the foam imparts the plurality of bubbles in the slurry. The coalescing agent coalesces the plurality of bubbles imparted by the foam. Typically, the coalescing agent coalesces a plurality of small and partially joined bubbles imparted by the foam to create larger and more discrete bubbles. A gypsum board and method of forming the slurry and the gypsum board are also disclosed. The gypsum board comprises a gypsum layer formed from the slurry. The gypsum layer defines a plurality of bubbles dispersed therein, which are imparted by the foam and coalescing agent of the slurry.
    Type: Application
    Filed: September 24, 2015
    Publication date: January 14, 2016
    Inventors: Ronald A. Lee, David T. Durocher, Sridhar Gopalkrishnan Iyer, Richard J. Romanek, Eli Stav, Karen Fey
  • Patent number: 9181132
    Abstract: A slurry for manufacturing gypsum board comprises calcined gypsum, water, a foaming agent, and a coalescing agent. The foaming agent imparts a plurality of bubbles in the slurry. Typically, a foam is pre-generated with the foaming agent and the foam is used to form the slurry such that the foam imparts the plurality of bubbles in the slurry. The coalescing agent coalesces the plurality of bubbles imparted by the foam. Typically, the coalescing agent coalesces a plurality of small and partially joined bubbles imparted by the foam to create larger and more discrete bubbles. A gypsum board and method of forming the slurry and the gypsum board are also disclosed. The gypsum board comprises a gypsum layer formed from the slurry. The gypsum layer defines a plurality of bubbles dispersed therein, which are imparted by the foam and coalescing agent of the slurry.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: November 10, 2015
    Assignee: BASF CORPORATION
    Inventors: Ronald A. Lee, David T. Durocher, Sridhar Gopalkrishnan Iyer, Richard J. Romanek, Eli Stav, Karen Fey
  • Publication number: 20120237756
    Abstract: A slurry for manufacturing gypsum board comprises calcined gypsum, water, a foaming agent, and a coalescing agent. The foaming agent imparts a plurality of bubbles in the slurry. Typically, a foam is pre-generated with the foaming agent and the foam is used to form the slurry such that the foam imparts the plurality of bubbles in the slurry. The coalescing agent coalesces the plurality of bubbles imparted by the foam. Typically, the coalescing agent coalesces a plurality of small and partially joined bubbles imparted by the foam to create larger and more discrete bubbles. A gypsum board and method of forming the slurry and the gypsum board are also disclosed. The gypsum board comprises a gypsum layer formed from the slurry. The gypsum layer defines a plurality of bubbles dispersed therein, which are imparted by the foam and coalescing agent of the slurry.
    Type: Application
    Filed: February 23, 2012
    Publication date: September 20, 2012
    Inventors: Ronald A. Lee, David T. Durocher, Sridhar Gopalkrishnan Iyer, Richard J. Romanek, Eli Stav, Karen Fey
  • Patent number: 6803396
    Abstract: Aqueous superplasticizer solutions for concrete compositions include a polymeric superplasticizer and an air-detraining effective amount of a block polyether containing ethylene oxide and propylene oxide units.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: October 12, 2004
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Kenneth L. Zack, Karl-Heinz Buechner
  • Patent number: 6743763
    Abstract: Stable aqueous laundry detergents containing vinly pyrrolidone copolymers are provided. The stable aqueous laundry detergents contain, in addition to the vinyl pyrrolidone copolymers, a combination of anionic and nonionic surfactants.
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: June 1, 2004
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Kathleen M. Guiney
  • Publication number: 20030073760
    Abstract: Aqueous superplasticizer solutions for concrete compositions include a polymeric superplasticizer and an air-detraining effective amount of a block polyether containing ethylene oxide and propylene oxide units.
    Type: Application
    Filed: August 16, 2001
    Publication date: April 17, 2003
    Inventors: Sridhar Gopalkrishnan, Kenneth L. Zack, Karl-Heinz Buechner
  • Patent number: 6342206
    Abstract: There is provided according to the present invention an aqueous gel composition, comprising a) an ethoxylated polyhydric alcohol which comprises a reaction product of an alcohol having 3 to 6 hydroxy groups with ethylene oxide; and b) a gelling agent selected from the group consisting of a polyoxyethylene/polyoxypropylene/polyoxyethylene triblock surfactant having a molecular weight of from 4,000 to 16,000, and wherein the weight of the polyoxyethylene blocks is from 55% to 90% of the weight of the triblock surfactant; a crosslinked polyacrylic thickener; cellulose derivatives; hydrated silicas; and mixtures thereof. When the gelling agent is the triblock surfactants, the ethoxylated polyhydric alcohol comprises the reaction product of the polyhydric alcohol and up to 5 mole equivalents of ethylene oxide per mole equivalent of hydroxyl group in the alcohol.
    Type: Grant
    Filed: December 27, 1999
    Date of Patent: January 29, 2002
    Inventors: Sridhar Gopalkrishnan, Richard J. Holland, James S. Dailey, Kathleen M. Guiney
  • Patent number: 5968884
    Abstract: The present invention relates to the formulation of stable, aqueous, concentrated built liquid detergents containing a hydrophilic copolymer and biodegradable chelant.
    Type: Grant
    Filed: April 7, 1997
    Date of Patent: October 19, 1999
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Kathleen Guiney
  • Patent number: 5919830
    Abstract: A stable non-aqueous carrier for personal care compositions comprising:a) about 80-98% by weight of a liquid polyoxyalkylene glycol of MW=3000-100000;b) about 2-20% by weight of a non-ionic solid triblock EO/PO/EO copolymer of MW=8500-25,000.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: July 6, 1999
    Inventors: Sridhar Gopalkrishnan, Richard J. Holland, Kathleen M. Guiney
  • Patent number: 5908612
    Abstract: The present invention relates to oral care compositions comprising Liquid Polyoxyalkylene Compounds as Solubilizers/Gelling Agents.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: June 1, 1999
    Assignee: BASF Corporation
    Inventors: James S. Dailey, Jay G. Otten, Jay Amarasekara, Sridhar Gopalkrishnan
  • Patent number: 5880081
    Abstract: The present invention relates to the formulation of stable, aqueous, concentrated built liquid detergents that contain a dye-transfer inhibiting additive. The invention also relates to a method of incorporating a dye-transfer inhibiting additive to a liquid detergent composition. The invention also relates to a method of stabilizing a liquid detergent composition containing a high molecular weight dye transfer inhibiting additive.
    Type: Grant
    Filed: April 7, 1997
    Date of Patent: March 9, 1999
    Inventors: Sridhar Gopalkrishnan, Kathleen M. Guiney
  • Patent number: 5863521
    Abstract: The present invention relates to liquid polyoxyalkylene compounds having improved flowability characteristics useful in a variety of industrial and personal care applications.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: January 26, 1999
    Assignee: BASF Corporation
    Inventors: Anthony G. Schaefer, Sridhar Gopalkrishnan, Jay G. Otten, Richard J. Holland
  • Patent number: 5855874
    Abstract: A dentifrice composition comprising a liquid polyalkylene glycol carrier, and a liquid polyoxyalkylene compound miscible in said liquid polyalkylene glycol carrier.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: January 5, 1999
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Richard Holland
  • Patent number: 5789369
    Abstract: A laundry detergent composition having antiredeposition properties comprising 0.01 to 20% of a hydrophilic copolymer by weight of the total surfactant in the laundry detergent composition wherein further, said hydrophilic copolymer comprises an unsaturated hydrophilic monomer and a hydrophilic oxyalkylated monomer.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: August 4, 1998
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Kathleen M. Guiney, John V. Sherman
  • Patent number: 5783549
    Abstract: The present invention relates to a method for retarding the gelation of aqueous sodium carbonate slurries comprising adding to said aqueous sodium carbonate slurry a polycarboxylate polymer having the following structure: ##STR1##
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: July 21, 1998
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Kathleen M. Guiney, John V. Sherman
  • Patent number: 5733861
    Abstract: An aqueous detergent slurry composition comprising (A) about 5-60% of inorganic builder salts; (B) about 5-70% of detergent active matter selected from the group consisting of anionic, nonionic, cationic, amphoteric and zwitterionic surfactants; and (C) about 0.01-10% of a hydrophilic copolymer comprising a hydrophilic monomer copolymerized with an oxyethylated monomer.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: March 31, 1998
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Kathleen M. Guiney, John V. Sherman, David T. Durocher, Michael C. Welch
  • Patent number: 5733856
    Abstract: A laundry detergency boosting polymer blend additive is made up of:a) a graft copolymer of polyalkylene oxide with vinyl ester, the graft copolymer having a molecular weight within the range of about 5,000 to 50,000; andb) at least one polycarboxylate selected from the group consisting of acrylic/maleic acid copolymers having a molecular weight within the range of about 1,000 to 100,000, and polyacrylic acid having a molecular weight of from about 1,000 to 100,000. The polymer blend additive is effective in water with an ion hardness in the range of about 50 to 500 ppm. The detergency boosting performance of the polymer blend additive is maintained or increased as the concentration of the hardness ions in water is increased.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: March 31, 1998
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Edward J. Parker, Richard J. Holland, Sonia Patterson
  • Patent number: 5709852
    Abstract: A stable non-aqueous carrier for personal care compositions comprising:a) about 80-98% by weight of a non-ionic liquid triblock EO/PO/EO copolymer of MW=1000-5000;b) about 2-20% by weight of a non-ionic solid triblock EO/PO/EO copolymer of MW=4000-16,000.
    Type: Grant
    Filed: December 5, 1995
    Date of Patent: January 20, 1998
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Richard J. Holland, John J. Burke, Kathleen M. Guiney
  • Patent number: 5618782
    Abstract: An aqueous detergent slurry composition comprising (A) about 5-60% of inorganic builder salts; (B) about 5-70% of detergent active matter selected from the group consisting of anionic, nonionic, cationic, amphoteric and zwitterionic surfactants; and (C) about 0.01-10% of a hydrophilic copolymer comprising a hydrophilic monomer copolymerized with an oxyalkylated monomer.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: April 8, 1997
    Assignee: BASF Corporation
    Inventors: Sridhar Gopalkrishnan, Kathleen M. Guiney, John V. Sherman, David T. Durocher, Michael C. Welch