Patents by Inventor Douglas Ronald Chambers

Douglas Ronald Chambers 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).

  • Aqueous polyurethane dispersions and coatings prepared therefrom
    Patent number: 6265468
    Abstract: The present invention is directed to two- and three- component aqueous polyurethane composition which are cured at ambient temperature and have excellent chemical resistance without reduction in abrasion resistance and flexibility. The two component system comprises a first component of a hydroxy functional aqueous polyurethane dispersion and phenoxy resin blended together, and a second component of polyisocyanate. The three component system comprises a first component of a hydroxy functional aqueous polyurethane dispersion, a second component of epoxy resin; and a third component of polyisocyanate. Generally, the mass of the epoxy or phenoxy resins is 1 to 50% of mass of the polyurethane solids in the dispersion and the mass of the polyisocyanate is 50 to 200% of the mass of the polyurethane solids in the dispersion. The two or three component polyurethane composition has a mass fraction of solids of preferably 10-50%.
    Type: Grant
    Filed: March 7, 2000
    Date of Patent: July 24, 2001
    Assignee: Vianova Resins, Inc.
    Inventors: Douglas Ronald Chambers, Mario Pschaidt, Allen T. Slocki, David LeBlanc, Tanya T. Ward, Brian S. Carpenter