Patents by Inventor Karl-Heinz Van Bonn

Karl-Heinz Van Bonn 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 preparing yellow iron oxide pigments with CaCoprecipitant
    Patent number: 7144455
    Abstract: The present invention relates to a process for preparing yellow iron oxide pigments by the precipitation method from iron(II) chloride or iron(II) sulphate raw material and calcium carbonate precipitant.
    Type: Grant
    Filed: August 27, 2004
    Date of Patent: December 5, 2006
    Assignee: Bayer Chemicals AG
    Inventors: Ulrich Meisen, Horst Brunn, Karl-Heinz Van Bonn, Holger Friedrich
  • Low coercive iron oxide pigments and a process for their preparation
    Patent number: 5480570
    Abstract: Cobalt coated, needle shaped berthollide iron oxide pigments are disclosed which have a core of the composition (Fe.sub.x.sup.2+, Fe.sub.2.sup.3+)O.sub.3+x wherein 0.3<x<0.75, optionally also including an intermediate coating of Zn-containing benhollide between the core and the cobalt coating. The pigments are prepared by first coating the core with berthollide and a soluble zinc compound, followed by coating with a cobalt compound.
    Type: Grant
    Filed: June 6, 1994
    Date of Patent: January 2, 1996
    Assignee: Toda Kogyo Corp.
    Inventors: Karl-Heinz van Bonn, Hendrik Kathrein, Gerhard Franz
  • 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