Patents by Inventor Dietbert Knofel

Dietbert Knofel 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).

  • Polymer-modified clay moulding
    Publication number: 20040087702
    Abstract: Clay moldings comprise a mineral material based on clay minerals as the main component and at least one hydrophopic, film-forming polymer uniformly distributed in the molding.
    Type: Application
    Filed: March 3, 2003
    Publication date: May 6, 2004
    Inventors: Mario Sandor, Manfred Schwartz, Bertold Bechert, Joachim Pakusch, Hans-Jurgen Denu, Dietbert Knofel, Karl-Georg Bottger
  • Use of polysulfide-free preparations as an additive for loam or clay-based construction materials
    Patent number: 6656994
    Abstract: The use is described of polysulfide-free preparations comprising, based on solids content, from 40 to 99.5% by weight of at least one water-dispersible copolymer and from 0.5 to 10% by weight of at least one alkoxylated ionic or nonionic emulsifier, as additives for construction materials based on loam or clay. The building materials based on loam or clay and comprising the preparation are described, as are the use of the construction materials and a process for treating construction materials with the preparation.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: December 2, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Stefan Dreher, Joachim Roser, Joachim Pakusch, Dietbert Knöfel, Karl-Georg Boettger
  • Water-dispersible or water-soluble polyurethanes as additives for building materials
    Patent number: 6051634
    Abstract: Use of water-dispersible or water-soluble polyether-urethanes, which optionally contain isocyanate groups, as additives for inorganic binders in the preparation of a building material, particularly a high-density or high-strength mortar or concrete composition. The building material resulting from the use of the water-dispersible or water-soluble polyether-urethanes.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: April 18, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Josef Laas, Jan Mazanek, Dietbert Knofel, Karl-Georg Bottger, Anke Reinschmidt
  • Use of nonionic, water-dispersible polyisocyanates as concrete additives
    Patent number: 6007619
    Abstract: The present invention relates to a process for preparing mortar/concrete compositions by incorporating into the mortar/concrete compositions either before or during the mixing operation a water-dispersible polyisocyanate whicha) has an average isocyanate functionality of 1.8 to 4.0,b) contains 4.0 to 25.0 wt. % of aliphatically and/or cycloaliphatically bound isocyanate groups (calculated as NCO; molecular weight=42) andc) contains 5 to 80 wt. % of ethylene oxide units present within polyether chains (calculated as C.sub.2 H.sub.4 O; molecular weight=44), in whichd) the polyether chains contain an average of 5 to 50 ethylene oxide units.
    Type: Grant
    Filed: December 11, 1997
    Date of Patent: December 28, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Josef Laas, Martin Brahm, Jan Mazanek, Hermann Kober, Manfred Schonfelder, Dietbert Knofel, Karl-Georg Bottger, Anke Reinschmidt