Patents by Inventor Bernd Krockert

Bernd Krockert 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).

  • Process for the jet milling of inorganic pigments
    Patent number: 5520340
    Abstract: The invention relates to a process for jet grinding inorganic pigments comprising the steps of compacting the inorganic pigments on a roller compactor at a predetermined linear force, and jet grinding the compacted inorganic pigments.
    Type: Grant
    Filed: November 5, 1992
    Date of Patent: May 28, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Krockert, Gunter Linde, Peter Kuske
  • Process for coloring building materials
    Patent number: 5322563
    Abstract: A method for coloring building materials is disclosed, wherein a pigment suspension is added to the building materials. The pigment suspension based on pigment granules contains at least one pigment such as iron oxide, and a soluble phosphate salt. The soluble phosphate salt has a number ratio of monofunctional metal ions to phosphorus of 2:1 to 1:1, and is exemplified by sodium pyrophosphate, sodium polyphosphate, and sodium hexametaphosphate.
    Type: Grant
    Filed: July 6, 1993
    Date of Patent: June 21, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Heinz van Bonn, Bernd Krockert, Gunter Linde
  • Process for the preparation of a pigment suspension
    Patent number: 5290352
    Abstract: Pigment suspensions of inorganic pigments are prepare compacting and grinding the unground pigments on a roller compactor, followed by processing of the compacted pigment in a wet grinding mill with addition of water. The process as described improves the particle size distribution of the pigment.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: March 1, 1994
    Assignee: Bayer AG
    Inventors: Bernd Krockert, Gunter Linde
  • Process for coloring building materials
    Patent number: 5215584
    Abstract: Building materials such as plaster, lime-sand bricks, fiber cement parts, cast stones, roof tiles, flagstone and paving setts are colored by incorporating therein in organic granules produced from a suspension of one or more inorganic pigmenting agents and a hydrolyzed or poorly soluble compound of one or more ion types present per se as an essential constitutent in one or more pigments.
    Type: Grant
    Filed: October 15, 1991
    Date of Patent: June 1, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gunter Buxbaum, Bernd Krockert
  • Process for coloring building materials
    Patent number: 5215583
    Abstract: Building materials are colored with pigments, for example iron oxide pigments, in the form of granules produced from a suspension of one or more pigments wherein the suspension also contains 0.05 to 5% of soluble salts, based on pigment weight.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: June 1, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Krockert, Gunter Linde
  • Process for coloring building materials
    Patent number: 5199986
    Abstract: Colored building materials are produced by incorporating into the building materials inorganic pigments in the form of granulates which are free-flowing and not dust forming wherein the pigments are produced from spray dried granulates by after-granulating.
    Type: Grant
    Filed: January 27, 1992
    Date of Patent: April 6, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Krockert, Gunter Linde, Manfred Eitel, Kurt Schafer, Klaus Rohbock
  • Process for the production of iron oxide yellow pigments
    Patent number: 5185141
    Abstract: Low-silking iron oxide yellow pigments having improved color qualities are produced by a novel method which utilizes both precipitation process and the Penniman process. Pigments are nucleated and grown by precipitation to achieve multiplication factor of 2.5 to 7 and additional pigment growth is carried out by the Penniman process.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: February 9, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Krockert, Helmut Printzen, Hans-Peter Biermann, Hans-Ulrich Hofs
  • Process for the preparation of iron yellow pigments
    Patent number: 5076848
    Abstract: An improved process is disclosed for preparing iron yellow pigments from iron--(II) salt solutions, in the presence of iron scrap, by injection of air at elevated temperatures. After formation of the pigment, the reaction suspension is stirred without additional gas injection, whereby lighter, purer yellow pigments are obtained.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: December 31, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Krockert, Helmut Printzen, Gunter Buxbaum
  • Heat stable iron oxide pigments of upsilon-Fe.sub.2 O.sub.3 structure, a process for their production and their use
    Patent number: 5049193
    Abstract: A pigment useful for coloring building materials such as bricks is a heat-stable isometric iron oxide brown pigment of .gamma.-Fe.sub.2 O.sub.3 structure which has a silicon content, expresed as SiO.sub.2, of 0.1 to 12% and an Al content, expressed as Al.sub.2 O.sub.3, of 0.02 to 5%.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: September 17, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Krockert, Gunter Buxbaum, Axel Westerhaus, Horst Brunn
  • Process for the production of iron oxide yellow pigments
    Patent number: 5032180
    Abstract: A process for the production of iron oxide yellow pigments by the Penniman-Zoph process from the raw materials iron (II) sulfate, sodium hydroxide and metallic iron, is disclosed in which iron (II) is oxidized to iron (III) by gassing with air in the presence of goethite nuclei, the iron (III) sulfate is dissolved to form iron (II) and the goethite nuclei are built up to iron oxide yellow pigments, characterized in that the gassing with air and dissolving of the metal are carried out in separate vessels.
    Type: Grant
    Filed: May 25, 1990
    Date of Patent: July 16, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernd Krockert, Helmut Printzen, Karl-Werner Ganter, Gunter Buxbaum