Patents by Inventor Kai Bütje

Kai Bütje 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).

  • Iron oxide pigments containing Al
    Patent number: 11634342
    Abstract: Aluminium-containing iron oxide pigments of the formula Fe2-xAlxO3 with x values from 0.01 to 0.25, characterized in that they possess an a* value of 30.5 to 32.5 CIELAB units and a b* value of 25.5 to 30.5 CIELAB units, measured in each case as full shade in the alkyd resin according to DIN EN ISO 787-25:2007.
    Type: Grant
    Filed: March 21, 2022
    Date of Patent: April 25, 2023
    Assignee: LANXESS Deutschland GmbH
    Inventors: Kai Buetje, Christine Kathrein, Carsten Rosenhahn, Juergen Kischkewitz, Ulrich Meisen, Peter Koehler
  • IRON OXIDE PIGMENTS CONTAINING AL
    Publication number: 20220259064
    Abstract: Aluminium-containing iron oxide pigments of the formula Fe2-xAlxO3 with x values from 0.01 to 0.25, characterized in that they possess an a* value of 30.5 to 32.5 CIELAB units and a b* value of 25.5 to 30.5 CIELAB units, measured in each case as full shade in the alkyd resin according to DIN EN ISO 787-25:2007.
    Type: Application
    Filed: March 21, 2022
    Publication date: August 18, 2022
    Applicant: LANXESS DEUTSCHLAND GMBH
    Inventors: Kai BUETJE, Christine KATHREIN, Carsten ROSENHAHN, Juergen KISCHKEWITZ, Ulrich MEISEN, Peter KOEHLER
  • IRON OXIDE PIGMENTS CONTAINING AL
    Publication number: 20210107803
    Abstract: Aluminium-containing iron oxide pigments of the formula Fe2-xAlxO3 with x values from 0.01 to 0.25, characterized in that they possess an a* value of 30.5 to 32.5 CIELAB units and a b* value of 25.5 to 30.5 CIELAB units, measured in each case as full shade in the alkyd resin according to DIN EN ISO 787-25: 2007.
    Type: Application
    Filed: March 19, 2018
    Publication date: April 15, 2021
    Applicant: LANXESS DEUTSCHLAND GMBH
    Inventors: Kai BUETJE, Christine KATHREIN, Carsten ROSENHAHN, Juergen KISCHKEWITZ, Ulrich MEISEN, Koehler KOEHLER
  • Process for the preparation of pigment granules and the use thereof
    Patent number: 7837785
    Abstract: The present invention relates to pigment granules and to a process for the preparation thereof and their use.
    Type: Grant
    Filed: April 23, 2007
    Date of Patent: November 23, 2010
    Assignee: LANXESS Deutschland GmbH
    Inventors: Holger Friedrich, Kai Bütje, Udo Holtmann
  • Composite particles
    Patent number: 6565973
    Abstract: The present invention relates to a composite particle containing a solid inorganic or organic colorless support material and adherent to it an inorganic and/or organic pigment particle, wherein the pigment particle has an average particle size of 1 nm to 100 nm, comprises at least one primary pigment particle and the minimum average distance between two pigment particles is at least one quarter of the diameter of the primary pigment particle, whereby the modified inorganic and organic pigments, depending on the pigment material, can be used as IR light absorbers or as color-imparting agents and give rise to a negligible haze in the matrix.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: May 20, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Daniel-Gordon Duff, Werner Hoheisel, Kai Bütje
  • Process for producing iron oxide pigments
    Patent number: 6503315
    Abstract: The present invention relates to a process for producing iron oxide red pigments containing the step of forming a suspension of haematite nuclei by reaction between dilute nitric acid and elemental iron above 90° C. and to pigments of pure color and their use.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: January 7, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Norbert Etzenbach, Kai Bütje