Patents by Inventor Christine KATHREIN

Christine KATHREIN 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 producing haematite pigments
    Patent number: 12187623
    Abstract: Process for producing a haematite pigment having an a* value greater than 20, especially greater than 25, CIELAB units measured as a full shade in alkyd resin to DIN EN ISO 787-25:2007, by reacting iron sulfate with oxygen in the presence of a pigment seed, characterized in that a) water comprising i) at least one pigment seed selected from the group consisting of FeOOH and Fe2O3 and ii) iron sulfate forms an initial charge and b) at least one alkaline earth metal carbonate, especially CaCO3, MgCO3, CaMg(CO3)2 or mixtures thereof and c) oxygen-containing gas are added to the initial charge, where at least 95% by weight of the total amount of iron sulfate used in the process is present in the initial charge a) prior to addition of components b) and c).
    Type: Grant
    Filed: January 15, 2020
    Date of Patent: January 7, 2025
    Assignee: LANXESS Deutschland GmbH
    Inventors: Larissa Schaufler, Anna Weber-Czaplik, Carsten Rosenhahn, Christine Kathrein
  • 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
  • Process for producing haematite pigments
    Publication number: 20220073366
    Abstract: Process for producing a haematite pigment having an a* value greater than 20, especially greater than 25, CIELAB units measured as a full shade in alkyd resin to DIN EN ISO 787-25:2007, by reacting iron sulfate with oxygen in the presence of a pigment seed, characterized in that a) water comprising i) at least one pigment seed selected from the group consisting of FeOOH and Fe2O3 and ii) iron sulfate forms an initial charge and b) at least one alkaline earth metal carbonate, especially CaCO3, MgCO3, CaMg(CO3)2 or mixtures thereof and c) oxygen-containing gas are added to the initial charge, where at least 95% by weight of the total amount of iron sulfate used in the process is present in the initial charge a) prior to addition of components b) and c).
    Type: Application
    Filed: January 15, 2020
    Publication date: March 10, 2022
    Applicant: LANXESS Deutschland GmbH
    Inventors: Larissa Schaufler, Anna Weber-Czaplik, Carsten Rosenhahn, Christine Kathrein
  • 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