Patents by Inventor Padma Kaviratna

Padma Kaviratna 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).

  • CARBON-COATED BiOCl PIGMENTS
    Publication number: 20210179856
    Abstract: BiOCl pigments coated with an amorphous carbon. A process for the preparation of the pigments. And use of the pigments prepared in this way, inter alia in paints, coatings, printing inks, plastics and cosmetics.
    Type: Application
    Filed: December 10, 2020
    Publication date: June 17, 2021
    Applicant: MERCK PATENT GMBH
    Inventors: Adeliene SCHMITT, Padma KAVIRATNA, Udo GUMSHEIMER, Mark TELLEFSEN, Qingmin CHENG
  • Pigment powders
    Patent number: 10676619
    Abstract: Disclosed are pigment powders containing only coated BiOCl flakes, which flakes area) BiOCl flakes having a coating containing yellow iron oxide Fe2O3*xH2O, optionally a colorant, optionally an adjuvant, and optionally SiO2, b) BiOCl flakes having a coating containing SiO2, optionally a colorant, and optionally an adjuvant, c) BiOCl flakes having a coating containing a colorant, SiO2, optionally yellow iron oxide Fe2O3*xH2O, and optionally an adjuvant, or d) BiOCl flakes having a coating containing Fe3O4 and optionally SiO2, to a process for the preparation of the pigment powders, and to the use thereof especially in cosmetic formulations.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: June 9, 2020
    Assignee: Merck Patent GmbH
    Inventors: Padma Kaviratna, Mark Tellefsen, Qingmin Cheng, Matthew Eddens, Qinyun Peng
  • PIGMENT POWDERS
    Publication number: 20180265708
    Abstract: Disclosed are pigment powders containing only coated BiOCl flakes, which flakes area) BiOCl flakes having a coating containing yellow iron oxide Fe2O3*xH2O, optionally a colorant, optionally an adjuvant, and optionally SiO2, b) BiOCl flakes having a coating containing SiO2, optionally a colorant, and optionally an adjuvant, c) BiOCl flakes having a coating containing a colorant, SiO2, optionally yellow iron oxide Fe2O3*xH2O, and optionally an adjuvant, or d) BiOCl flakes having a coating containing Fe3O4 and optionally SiO2, to a process for the preparation of the pigment powders, and to the use thereof especially in cosmetic formulations.
    Type: Application
    Filed: March 19, 2018
    Publication date: September 20, 2018
    Applicant: Merck Patent GmbH
    Inventors: Padma KAVIRATNA, Mark TELLEFSEN, Qingmin CHENG, Matthew EDDENS, Qinyun PENG
  • Photostabilised effect pigments
    Patent number: 7455726
    Abstract: The present invention relates to photostabilised effect pigments in which one or more calcined and vanadium-containing oxide layers, alone or mixed with sulfates, borates or phosphates, have been applied to a substrate, to a process for the preparation thereof, and to the use thereof in plastics, paints, coatings, printing inks, cosmetics, films, in security printing, for laser marking, in thermal protection or for colouring seed.
    Type: Grant
    Filed: April 27, 2004
    Date of Patent: November 25, 2008
    Assignee: Merck Patent GmbH
    Inventors: Ulrich Schoenefeld, Padma Kaviratna
  • Photostabilised effect pigments
    Publication number: 20070060668
    Abstract: The present invention relates to photostabilised effect pigments in which one or more calcined and vanadium-containing oxide layers, alone or mixed with sulfates, borates or phosphates, have been applied to a substrate, to a process for the preparation thereof, and to the use thereof in plastics, paints, coatings, printing inks, cosmetics, films, in security printing, for laser marking, in thermal protection or for colouring seed.
    Type: Application
    Filed: April 27, 2004
    Publication date: March 15, 2007
    Inventors: Ulrich Schoenefeld, Padma Kaviratna