Patents by Inventor Wolfgang Glasser

Wolfgang Glasser 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).

  • Sulfoalkylated cellulose
    Publication number: 20060142560
    Abstract: Sulfoalkylated cellulose having superabsorbent properties and methods for making sulfoalkylated cellulose.
    Type: Application
    Filed: December 29, 2004
    Publication date: June 29, 2006
    Inventors: Wolfgang Glasser, Alena Michalek
  • SULFOALKYLATED CELLULOSE POLYMER NETWORK
    Publication number: 20060142484
    Abstract: Sulfoalkylated cellulose polymer network having superabsorbent properties.
    Type: Application
    Filed: December 29, 2004
    Publication date: June 29, 2006
    Inventors: Wolfgang Glasser, Alena Michalek, S. Weerawarna, Carole Herriott, Richard Jewell
  • Method for making sulfoalkylated cellulose polymer network
    Publication number: 20060142477
    Abstract: Method for making a sulfoalkylated cellulose polymer network having superabsorbent properties.
    Type: Application
    Filed: December 29, 2004
    Publication date: June 29, 2006
    Inventors: Wolfgang Glasser, Alena Michalek, S. Weerawarna, Carole Herriott, Richard Jewell
  • Alkylene oxide esters of lignin sulfonic acid
    Patent number: 5102991
    Abstract: Lignin sulfonates are converted into sulfonic acid esters by blocking free phenolic hydroxyl groups on the lignin sulfonates from reaction with a suitable protective group, subjecting the blocked lignin sulfonate in aqueous solution to ion exchange to produce the free sulfonic acid thereof, exchanging the aqueous solvent into a polar organic solvent, such as isopropanol, and reacting the sulfonic acid derivative in the polar organic solvent with a saturated or unsaturated aliphatic epoxide, preferably an alkylene oxide. The resulting sulfonic acid ester adduct may be isolated and purified from the reactants using solvent extraction. Lignin sulfonic acid ester adducts are produced that are soluble in a variety of organic solvents and insoluble in water.
    Type: Grant
    Filed: April 11, 1990
    Date of Patent: April 7, 1992
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Wolfgang Glasser, Kaliprasanna Dhara