Patents by Inventor Arjun Chandra Sau

Arjun Chandra Sau 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).

  • Process for thickening an aqueous system
    Patent number: 6479573
    Abstract: Process for thickening aqueous systems by addition of aqueous suspensions of water-soluble hydrophobically modified polyurethanes, polyacrylates and poly(acetal- or ketal-polyethers) and carbon containing salts.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: November 12, 2002
    Assignee: Hercules Incorporated
    Inventors: Charles Lee Burdick, Arjun Chandra Sau
  • Fluidized polymer suspension of hydrophobically modified poly(acetal- or ketal-polyether) polyurethane and polyacrylate
    Patent number: 6433056
    Abstract: Aqueous suspensions of water-soluble hydrophobically modified polyurethanes, polyacrylates and poly(acetal- or ketal-polyethers) and carbon containing salts, process of making the suspensions and process of using them as thickeners for aqueous systems.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: August 13, 2002
    Assignee: Hercules Incorporated
    Inventors: Charles Lee Burdick, Arjun Chandra Sau
  • Process for thickening an aqueous system
    Publication number: 20020052441
    Abstract: Process for thickening aqueous systems by addition of aqueous suspensions of water-soluble hydrophobically modified polyurethanes, polyacrylates and poly(acetal- or ketal-polyethers) and carbon containing salts.
    Type: Application
    Filed: September 12, 2001
    Publication date: May 2, 2002
    Inventors: Charles Lee Burdick, Arjun Chandra Sau
  • Fine particle size low bulk density thermoplastic polymers
    Patent number: 6369132
    Abstract: Fine particulate thermoplastic polymers [e.g., hydrophobically modified polyether-polyurethanes, polyacrylates, polyvinyl alcohol, polyether-polyols, polyacrylamide, aminoplast-polyethers and poly(acetal- or ketal-polyethers] having reduced bulk density, process of making same by dissolving the polymer and rapidly insolubilizing the polymer from the solution and process of using aqueous suspensions of such polymers as thickeners for aqueous systems.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: April 9, 2002
    Assignee: Hercules Incorporated
    Inventor: Arjun Chandra Sau
  • FINE PARTICLE SIZE LOW BULK DENSITY THERMOPLASTIC POLYMERS
    Publication number: 20020006985
    Abstract: Fine particulate thermoplastic polymers [e.g., hydrophobically modified polyether-polyurethanes polyacrylates, polyvinyl alcohol, polyether-polyols, polyacrylamide, aminoplast-polyethers and poly (acetal- or ketal-polyethers] having reduced bulk density, process of making same by dissolving the polymer and rapidly insolubilizing the polymer from the solution and process of using aqueous suspensions of such polymers as thickeners for aqueous systems.
    Type: Application
    Filed: October 17, 1997
    Publication date: January 17, 2002
    Inventor: ARJUN CHANDRA SAU
  • Biostable water-borne paints
    Patent number: 5989329
    Abstract: Water-borne paints containing reduced molecular weight polysaccharide derivatives that are resistant to enzyme hydrolysis. The water-borne paints are biostable, retaining at least about 80% of their initial viscosity 24 hours after they are inoculated with polysaccharide hydrolysis enzyme.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: November 23, 1999
    Assignee: Hercules Incorporated
    Inventor: Arjun Chandra Sau
  • Biostable water-borne paints and processes for their preparation
    Patent number: 5879440
    Abstract: Water-borne paints containing reduced molecular weight polysaccharide derivatives that are resistant to enzyme hydrolysis. The water-borne paints are biostable, retaining at least about 80% of their initial viscosity 24 hours after they are inoculated with polysaccharide hydrolysis enzyme. A process for making the biostable water-borne paints has the steps: a) treating precursor polysaccharide derivative with polysaccharide hydrolysis enzyme in aqueous medium for a time sufficient to obtain reduced molecular weight polysaccharide derivative; and b) mixing the reduced molecular weight polysaccharide derivative with an effective amount of at least one other water-borne paint ingredient to obtain a water-borne paint.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: March 9, 1999
    Assignee: Hercules Incorporated
    Inventor: Arjun Chandra Sau