Patents by Inventor Leif Karlson

Leif Karlson 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).

  • Associative water-soluble cellulose ethers
    Patent number: 8487089
    Abstract: The present invention relates to a water-soluble associative cellulose ether having a DP viscosity from 250 to 20,000 mPa·s, measured at a concentration of 1% by weight, and a molecular substitution, MS, from 0.0001 to 0.005 of a hydrophobic substituent containing an unsubstituted or substituted hydrocarbon group of 8-24 carbon atoms. The cellulose ether has a good thickening effect and advantageous application properties at low contents and can be used in an aqueous decorative paint composition, an aqueous paper coating composition, an aqueous organic filler composition, an aqueous cement slurry, an aqueous detergent composition or an aqueous personal care formulation.
    Type: Grant
    Filed: December 15, 2004
    Date of Patent: July 16, 2013
    Assignee: Akzo Nobel N.V.
    Inventors: Peter Boström, Leif Karlson
  • Water-Soluble Cellulose Derivative Comprising A Ligand
    Publication number: 20080033162
    Abstract: The invention relates to novel cellulose derivatives comprising a ligand capable of forming a complex with a polyvalent metal ion. The invention further pertains to a process of preparing such cellulose derivatives.
    Type: Application
    Filed: June 27, 2005
    Publication date: February 7, 2008
    Applicant: Akzo Nobel N.V.
    Inventors: Leif Karlson, Behrouz Syrous
  • Associative water-soluble cellulose ethers
    Publication number: 20070059267
    Abstract: The present invention relates to a water-soluble associative cellulose ether having a DP viscosity from 250 to 20,000 mPa·s, measured at a concentration of 1% by weight, and a molecular substitution, MS, from 0.0001 to 0.005 of a hydrophobic substituent containing an unsubstituted or substituted hydrocarbon group of 8-24 carbon atoms. The cellulose ether has a good thickening effect and advantageous application properties at low contents and can be used in an aqueous decorative paint composition, an aqueous paper coating composition, an aqueous organic filler composition, an aqueous cement slurry, an aqueous detergent composition or an aqueous personal care formulation.
    Type: Application
    Filed: December 15, 2004
    Publication date: March 15, 2007
    Applicant: AKZO NOBEL N.V.
    Inventors: Peter Boström, Leif Karlson
  • Nonionic cellulose ether with improved thickening properties
    Patent number: 6362238
    Abstract: The present invention relates to associative cellulose ethers with improved thickening effects, especially in paint. The improvement depends on the presence of a hydrophobic modifying group of the general formula where R is an aliphatic group of 12-22 carbon atoms and n is a number from 3 to 7. The DS of the hydrophobic group is 0.003 to 0.012.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: March 26, 2002
    Assignee: Akzo Nobel N.V.
    Inventor: Leif Karlson
  • Nonionic cellulose ether with improved thickening properties
    Publication number: 20010018468
    Abstract: The present invention relates to associative cellulose ethers with improved thickening effects, especially in paint.
    Type: Application
    Filed: March 15, 2001
    Publication date: August 30, 2001
    Inventor: Leif Karlson
  • Nonionic cellulose ether with improve thickening properties
    Patent number: 6248880
    Abstract: The present invention relates to associative cellulose ethers with improved thickening effects, especially in paint. The improvement depends on the presence of a hydrophobic modifying group of the general formula where R is an aliphatic group of 12-22 carbon atoms and n is a number from 3 to 7. The DS of the hydrophobic group is 0.003 to 0.012.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: June 19, 2001
    Assignee: Akzo Nobel NV
    Inventor: Leif Karlson