Patents by Inventor Charles Lee Burdick

Charles Lee Burdick 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 high bulk density methylcelluloses in aqueous fluid polymer suspensions
    Patent number: 6576048
    Abstract: An aqueous fluidized polymer suspension is comprised of at least 20% by total weight of the suspension of at least one member selected from methylcellulose, methylhydroxypropylcellulose and methylhydroxyethylcellulose having a bulk density of 0.30 g/ml or greater dispersed in an aqueous solution of at least one salt dissolved therein. These suspensions have many industrial uses; for example, they can be used for joint compound manufacture, tile cement thickening, food additives, adhesives, and in many other water based systems.
    Type: Grant
    Filed: September 14, 1993
    Date of Patent: June 10, 2003
    Inventors: Charles Lee Burdick, Thomas J. Podlas
  • 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
  • Fluidized polymer suspensions of cationic polysaccharides in emollients and use thereof in preparing personal care compositions
    Patent number: 6113891
    Abstract: There are disclosed stable fluidized polymer suspensions containing cationic polysaccharide, stabilizing agent and emollient. The preferred cationic polysaccharides are cationic guar and cationic hydroxypropyl guar, and preferred emollients are hydrocarbons, silicone oils and esters. Processes for preparing personal care compositions utilizing the fluidized polymer suspensions are also disclosed. Using the fluidized polymer suspensions in the processes provides the advantages of more rapid dissolution and avoidance of lumps and gels when compared to using dry, powdered cationic polysaccharides.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: September 5, 2000
    Assignee: Hercules Incorporated
    Inventors: Charles Lee Burdick, Jacobus Johannes deBruin, Hans Hofman, Mohand Melbouci
  • Fluidized polymer suspensions of cationic polysaccharides in polyols and use thereof in personal care compositions
    Patent number: 6093769
    Abstract: There are disclosed stable fluidized polymer suspensions containing cationic polysaccharide, stabilizing agent and water-soluble polyol. The preferred cationic polysaccharides are cationic guar and cationic hydroxypropyl guar. Processes for preparing personal care compositions utilizing the fluidized polymer suspensions are also disclosed. Using the fluidized polymer suspensions in the processes provides advantages of more rapid dissolution and avoidance of lumps and gels when compared to using dry, powdered cationic polysaccharides.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: July 25, 2000
    Assignee: Hercules Incorporated
    Inventors: Charles Lee Burdick, Mohand Melbouci, Hans Hofman, Jacobus Johannes deBruin
  • Aqueous suspensions of poly(ethylene oxide) useful as a flocculent
    Patent number: 5645731
    Abstract: A method is provided for using an aqueous suspension of at least 15% of poly(ethylene oxide)(PEO) as a flocculent. PEO is dispersed in an aqueous solution of at least one salt selected from the group consisting of sodium or potassium formate, sodium or potassium hydroxide, sodium or potassium citrate, sodium or potassium acetate, sodium chloride or mixtures thereof to form a poly(ethylene oxide) suspension having at least 15% of poly(ethylene oxide) by total weigh.
    Type: Grant
    Filed: August 26, 1996
    Date of Patent: July 8, 1997
    Assignee: Hercules Incorporated
    Inventors: Charles Lee Burdick, Elliott Echt