Patents by Inventor Gerhard Pfaff

Gerhard Pfaff 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).

  • Patent number: 8337611
    Abstract: Disclosed are yellowing-stable, silver-white effect pigments having high whiteness based on synthetic mica flakes and to the use thereof in paints, lacquers, printing inks, plastics, button pastes, ceramic materials, glasses, for coloring seed, as dopant in laser markings of plastics and papers, as additive for laser welding of plastics, as additive for coloring in the foods and pharmaceuticals sectors and in cosmetic formulations, and for the preparation of pigment compositions and dry preparations.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: December 25, 2012
    Assignee: Merck Patent GmbH
    Inventors: Gerhard Pfaff, Johann Dietz, Sabine Schoen, Doreen Warthe
  • Publication number: 20110300200
    Abstract: The present invention relates to intensely coloured and light-stable effect pigments based on transparent, undoped SiO2 flakes, which are distinguished by the fact that they are covered with an iron-oxide layer having a thickness of 30-150 nm, and all SiO2 flakes have an identical thickness, and the thickness of the SiO2 flakes is 250-400 nm, and to the use thereof in pigment mixtures, in cosmetic formulations and for colouring foods and pharmaceutical products.
    Type: Application
    Filed: August 15, 2011
    Publication date: December 8, 2011
    Inventors: Gerhard Pfaff, Johann Dietz, Cornelia Foerderer, Xenia Petsitis, Doreen Warthe, Veronika Hochstein
  • Publication number: 20100151047
    Abstract: Disclosed are yellowing-stable, silver-white effect pigments having high whiteness based on synthetic mica flakes and to the use thereof in paints, lacquers, printing inks, plastics, button pastes, ceramic materials, glasses, for coloring seed, as dopant in laser markings of plastics and papers, as additive for laser welding of plastics, as additive for coloring in the foods and pharmaceuticals sectors and in cosmetic formulations, and for the preparation of pigment compositions and dry preparations.
    Type: Application
    Filed: February 17, 2010
    Publication date: June 17, 2010
    Inventors: Gerhard PFAFF, Johann Dietz, Sabine Schoen, Doreen Warthe
  • Patent number: 7708823
    Abstract: The present invention relates to semitransparent interference pigments having a neutral mass tone comprising a substrate and a coating comprising metallic tin and additionally at least one metal oxide, to a process for the preparation of these pigments, and to the use thereof.
    Type: Grant
    Filed: June 9, 2006
    Date of Patent: May 4, 2010
    Assignee: Merck Patent GmbH
    Inventors: Helge Bettina Kniess, Klaus Bernhardt, Wolf-Dietrich Weber, Gerhard Pfaff
  • Patent number: 7691196
    Abstract: Disclosed are yellowing-stable, silver-white effect pigments having high whiteness based on synthetic mica flakes and to the use thereof in paints, lacquers, printing inks, plastics, button pastes, ceramic materials, glasses, for coloring seed, as dopant in laser markings of plastics and papers, as additive for laser welding of plastics, as additive for coloring in the foods and pharmaceuticals sectors and in cosmetic formulations, and for the preparation of pigment compositions and dry preparations.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: April 6, 2010
    Assignee: Merck Patent GmbH
    Inventors: Gerhard Pfaff, Johann Dietz, Sabine Schoen, Doreen Warthe
  • Patent number: 7611574
    Abstract: The invention relates to an interference pigment with a high covering power, comprising at least one FeTiO3-containing layer, which is applied to a lamellar inorganic substrate and whose thickness and absorbing power can be precisely set. The invention also relates to a method for producing this interference pigment and to the use thereof.
    Type: Grant
    Filed: May 5, 2004
    Date of Patent: November 3, 2009
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Helge Kniess, Gerhard Pfaff, Klaus Bernhardt
  • Publication number: 20090220557
    Abstract: The present invention relates to intensely coloured and light-stable effect pigments based on transparent, undoped SiO2 flakes, which are distinguished by the fact that they are covered with an iron-oxide layer having a thickness of 30-150 nm, and all SiO2 flakes have an identical thickness, and the thickness of the SiO2 flakes is 250-400 nm, and to the use thereof in pigment mixtures, in cosmetic formulations and for colouring foods and pharmaceutical products.
    Type: Application
    Filed: November 7, 2006
    Publication date: September 3, 2009
    Inventors: Gerhard Pfaff, Johann Dietz, Cornelia Foerderer, Xenia Petsitis, Doreen Warthe, Veronika Hochstein
  • Publication number: 20080210123
    Abstract: The present invention relates to semitransparent interference pigments having a neutral mass tone comprising a substrate and a coating comprising metallic tin and additionally at least one metal oxide, to a process for the preparation of these pigments, and to the use thereof.
    Type: Application
    Filed: June 9, 2006
    Publication date: September 4, 2008
    Inventors: Helge Kniess, Klaus Bernhardt, Wolf-Dietrich Weber, Gerhard Pfaff
  • Publication number: 20080207772
    Abstract: The present invention relates to a mixture of interference pigments, where the mixture comprises at least one interference pigment A comprising a substrate and a coating comprising metallic iron, and an interference pigment B comprising a substrate and a coating comprising metallic tin and in addition at least one metal oxide, to the use thereof in cosmetics, surface coatings, inks, plastics, films, in security printing, in security features in documents and identity papers, for colouring seed, for colouring foods, for laser marking or in medicament coatings and for the preparation of pigment compositions and dry preparations, and to cosmetics, surface coatings, inks, plastics, films, documents and identity papers, seed, foods or medicament coatings, pigment compositions and dry preparations comprising the mixture according to the invention.
    Type: Application
    Filed: June 9, 2006
    Publication date: August 28, 2008
    Inventors: Helge Bettina Kniess, Gerhard Pfaff
  • Patent number: 7416688
    Abstract: Disclosed are transparent conductive pigments of flake-form substrates coated with a conductive layer, where the number-weighted mean particle area F50 of the transparent conductive pigments is greater than or equal to 150 ?m2, and processes for the production of the pigments, and the use thereof.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: August 26, 2008
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Gerhard Pfaff, Reinhold Rueger, Otto Stahlecker, Frank Ott
  • Publication number: 20080200560
    Abstract: The present invention relates to pigments comprising a substrate and, applied thereto, an iron-containing coating comprising metallic iron, process for the preparation of the pigments according to the invention, and the use thereof.
    Type: Application
    Filed: June 16, 2006
    Publication date: August 21, 2008
    Inventors: Helge Bettina Kniess, Gerhard Pfaff
  • Publication number: 20080047470
    Abstract: Disclosed are yellowing-stable, silver-white effect pigments having high whiteness based on synthetic mica flakes and to the use thereof in paints, lacquers, printing inks, plastics, button pastes, ceramic materials, glasses, for coloring seed, as dopant in laser markings of plastics and papers, as additive for laser welding of plastics, as additive for coloring in the foods and pharmaceuticals sectors and in cosmetic formulations, and for the preparation of pigment compositions and dry preparations.
    Type: Application
    Filed: June 7, 2007
    Publication date: February 28, 2008
    Inventors: Gerhard Pfaff, Johann Dietz, Sabine Schoen, Doreen Warthe
  • Patent number: 7255736
    Abstract: Effect pigments having improved optical properties based on SiO2 flakes coated with one or more layers, where the SiO2 flakes have a thickness of from 50 nm to 150 nm; processes for the preparation thereof; and use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity cards, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations; are disclosed.
    Type: Grant
    Filed: October 11, 2005
    Date of Patent: August 14, 2007
    Assignee: Merck Patent GmbH
    Inventors: Gerhard Pfaff, Doreen Warthe, Johann Dietz, Cornelia Foerderer
  • Patent number: 7202288
    Abstract: Laser-markable pigments which are distinguished by the fact that an absorber is coated with a marker and optionally with a diffusion barrier are described. Further, processes for the preparation of the laser-markable pigments and methods for using them are described. The absorber is preferably an inorganic pigment or a filler. The marker is preferably an intrinsically laser-markable polymer, particularly a polyethylene terephthalate, acrylonitrile-butadiene-styrene, polystyrene, polyphenylene ether, liquid-crystal polymer or polyphenylene sulfide.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: April 10, 2007
    Assignee: Merck Patent GmbH
    Inventors: Helge Bettina Kniess, Gerhard Pfaff, Matthias Kuntz, Hans-Juergen Brehm, Reiner Delp
  • Publication number: 20070028799
    Abstract: The invention relates to an interference pigment with a high covering power, comprising at least one FeTiO3-containing layer, which is applied to a lamellar inorganic substrate and whose thickness and absorbing power can be precisely set. The invention also relates to a method for producing this interference pigment and to the use thereof.
    Type: Application
    Filed: May 5, 2004
    Publication date: February 8, 2007
    Inventors: Helge Kniess, Gerhard Pfaff, Klaus Bernhardt
  • Patent number: 7169223
    Abstract: The present invention relates to effect pigments having a color flop comprising metal oxide-coated SiO2 flakes having a uniform layer thickness, where the color flop runs through all four quadrants of the a,b color coordinate system (CIELAB L,a,b system). The present invention likewise relates to processes for the preparation of these pigments in which SiO2 flakes having a uniform layer thickness are coated with metal oxides, and to the use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity papers, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: January 30, 2007
    Assignee: Merck Patent GmbH
    Inventors: Gerhard Pfaff, Cornelia Foerderer, Doreen Warthe, Johann Dietz
  • Patent number: 7156913
    Abstract: The present invention relates to intensely colored red effect pigments comprising iron oxide-coated SiO2 flakes, where the total thickness of the effect pigments is not greater than 500 nm (+/?30 nm). The present invention likewise relates to processes for the preparation of these pigments in which SiO2 flakes are coated with iron oxide, where the thicknesses of the SiO2 flakes and of the iron-oxide layers are selected in such a way that the total thickness of the red effect pigments is not greater than 500 nm (+/?30 nm), and to the use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity papers, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: January 2, 2007
    Assignee: Merck Patent GmbH
    Inventors: Gerhard Pfaff, Cornelia Foerderer, Doreen Warthe, Johann Dietz
  • Publication number: 20060156949
    Abstract: The present invention relates to intensely colored red effect pigments comprising iron oxide-coated SiO2 flakes, where the total thickness of the effect pigments is not greater than 500 nm (+/?30 nm). The present invention likewise relates to processes for the preparation of these pigments in which SiO2 flakes are coated with iron oxide, where the thicknesses of the SiO2 flakes and of the iron-oxide layers are selected in such a way that the total thickness of the red effect pigments is not greater than 500 nm (+/?30 nm), and to the use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity papers, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations.
    Type: Application
    Filed: January 13, 2006
    Publication date: July 20, 2006
    Inventors: Gerhard Pfaff, Cornelia Foerderer, Doreen Warthe, Johann Dietz
  • Publication number: 20060159920
    Abstract: The invention relates to flake-form effect pigments, characterised in that they consist of transparent or semitransparent materials and have a groove or grid structure, to processes for the production thereof, and to the use thereof.
    Type: Application
    Filed: October 17, 2003
    Publication date: July 20, 2006
    Inventors: Peter Reynders, Reinhold Rueger, Michael Jungnitz, Michael Ukelis, Gerhard Pfaff, Volker Hilarius, Gerald Fuchs-Pohl
  • Patent number: 7060126
    Abstract: The invention relates to multilayered luster pigments based on metallic substrates, which are completely surrounded by a plurality of layers, where these layers comprise at least one layer pack (A) having a colorless dielectric layer of a material with a refractive index n of ?1.8, and a colorless dielectric layer of a material with a refractive index n of >1.8, and a selectively or non-selectively absorbent layer (B), and to a process for their production, and to their use.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: June 13, 2006
    Assignee: Merck Patent GmbH
    Inventors: Stephanie Andes, Gerald Fuchs-Pohl, Martin Friz, Gerhard Pfaff, Siegfried Raabe, Michael Uhlig