Patents by Inventor Hans Rydgren

Hans Rydgren 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 cement composition
    Patent number: 7288149
    Abstract: A fresh aqueous cement composition suitable for building purposes is described. It contains, besides a hydraulic cement, a methyl ethyl cellulose ether having a DS methyl of 0.4-2.2, a DS ethyl of 0.05-0.8 and a MS hydroxy-(C2-C3)-alkyl of 0-2. The celulose ether imparts excellent rheology properties, including a high water-retention combined with a long open time, to the cement composition. A dry blend and a rheology additive containing the cellulose ether are also described.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: October 30, 2007
    Assignee: Akzo Nobel N.V.
    Inventors: Hans Rydgren, Kjell Stridh
  • Aqueous cement composition
    Publication number: 20050000391
    Abstract: A fresh aqueous cement composition suitable for building purposes is described. It contains, besides a hydraulic cement, a methyl ethyl cellulose ether having a DS methyl of 0.4-2.2, a DS ethyl of 0.050.8 and a MS hydroxy-(C2-C3)-alkyl of 0-2. The celulose ether imparts excellent rheology properties, including a high water-retention combined with a long open time, to the cement composition. A dry blend and a rheology additive containing the cellulose ether are also described.
    Type: Application
    Filed: November 26, 2002
    Publication date: January 6, 2005
    Inventors: Hans Rydgren, Kjell Stridh