Patents by Inventor Burkhard Krietsch

Burkhard Krietsch 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).

  • Intensely coloured and/or optically variable pigments having an electrically conductive core
    Patent number: 8940189
    Abstract: The present invention relates to intensely colored and/or optically variable pigments which have a flake-form transparent or semitransparent electrically conductive core and at least one coloring dielectric layer surrounding the core, to a process for the preparation of such pigments, and to the use thereof.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: January 27, 2015
    Assignee: Merck Patent GmbH
    Inventors: Burkhard Krietsch, Matthias Kuntz, Reinhold Rueger
  • Optically variable security element
    Patent number: 8642161
    Abstract: The present invention relates to an optically variable security element for protecting articles against counterfeiting, to a process for the production of a security element of this type, and to the use thereof.
    Type: Grant
    Filed: November 8, 2007
    Date of Patent: February 4, 2014
    Assignee: Merck Patent GmbH
    Inventors: Matthias Kuntz, Dieter Heinz, Ute Honeit, Burkhard Krietsch
  • Machine-readable security element for security products
    Patent number: 8540812
    Abstract: The present invention relates to a machine-readable security element for security products which comprises at least one particulate substance having electroluminescent properties and a transparent, electrically conductive pigment, to a priming ink for the production of a security element of this type, and to a security product which includes the security element.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: September 24, 2013
    Assignee: MERCK PATENT GmbH
    Inventors: Burkhard Krietsch, Matthias Kuntz, Oliver Muth, Manfred Paeschke, Jakob Kuen
  • Optically variable pigments of high electrical conductivity
    Patent number: 8454861
    Abstract: The present invention relates to optically variable pigments of high electrical conductivity which comprise a flake-form substrate, which essentially consists of silicon dioxide and/or silicon oxide hydrate, and an electrically conductive layer surrounding the substrate, to a process for the preparation thereof, and to the use of pigments of this type.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: June 4, 2013
    Assignee: Merck Patent GmbH
    Inventors: Burkhard Krietsch, Matthias Kuntz, Reinhold Rueger
  • MACHINE-READABLE SECURITY ELEMENT FOR SECURITY PRODUCTS
    Publication number: 20110297039
    Abstract: The present invention relates to a machine-readable security element for security products which comprises at least one particulate substance having electroluminescent properties and a transparent, electrically conductive pigment, to a priming ink for the production of a security element of this type, and to a security product which includes the security element.
    Type: Application
    Filed: August 5, 2011
    Publication date: December 8, 2011
    Inventors: Burkhard KRIETSCH, Matthias Kuntz, Oliver Muth, Manfred Paeschke, Jakob Kuen
  • Machine-readable security element for security products
    Patent number: 8039094
    Abstract: The invention relates to a machine-readable security element for security products, containing at least one particulate substance that has electroluminescent properties and a transparent, electrically conductive pigment. Also disclosed are a printing ink for producing such a security element and a security product comprising said security element.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: October 18, 2011
    Assignees: Merck Patent GmbH, Bundesdruckerei GmbH
    Inventors: Burkhard Krietsch, Matthias Kuntz, Oliver Muth, Manfred Paeschke, Jakob Kuen
  • INTENSELY COLOURED AND/OR OPTICALLY VARIABLE PIGMENTS HAVING AN ELECTRICALLY CONDUCTIVE CORE
    Publication number: 20100270510
    Abstract: The present invention relates to intensely coloured and/or optically variable pigments which have a flake-form transparent or semitransparent electrically conductive core and at least one colouring dielectric layer surrounding the core, to a process for the preparation of such pigments, and to the use thereof.
    Type: Application
    Filed: December 11, 2008
    Publication date: October 28, 2010
    Applicant: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Burkhard Krietsch, Matthias Kuntz, Reinhold Rueger
  • OPTICALLY VARIABLE PIGMENTS OF HIGH ELECTRICAL CONDUCTIVITY
    Publication number: 20100258769
    Abstract: The present invention relates to optically variable pigments of high electrical conductivity which comprise a flake-form substrate, which essentially consists of silicon dioxide and/or silicon oxide hydrate, and an electrically conductive layer surrounding the substrate, to a process for the preparation thereof, and to the use of pigments of this type.
    Type: Application
    Filed: December 11, 2008
    Publication date: October 14, 2010
    Applicant: Merck Patent GmbH
    Inventors: Burkhard Krietsch, Matthias Kuntz, Reinhold Rueger
  • Dual security mark
    Patent number: 7713616
    Abstract: The invention relates to a flat dual security feature which comprises two different security components, one of which can be verified in the visible spectral region and one of which can be verified in the ultraviolet spectral region of light, and which comprises flake-form effect pigments and luminescent pigments in such a low concentration that the latter are evident to the naked eye as individual particles under the action of UV light; to a process for the production thereof, and to the use thereof.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: May 11, 2010
    Assignee: Merck Patent GmbH
    Inventors: Matthias Kuntz, Burkhard Krietsch, Andreas Walter
  • MACHINE-READABLE SECURITY ELEMENT FOR SECURITY PRODUCTS
    Publication number: 20100024681
    Abstract: The invention relates to a machine-readable security element for security products, containing at least one particulate substance that has electroluminescent properties and a transparent, electrically conductive pigment. Also disclosed are a printing ink for producing such a security element and a security product comprising said security element.
    Type: Application
    Filed: April 29, 2005
    Publication date: February 4, 2010
    Applicants: MERCK PATENT GMBH, EREI GMBH
    Inventors: Burkhard Krietsch, Matthias Kuntz, Oliver Muth, Manfred Paeschke, Jakob Kuen
  • Security Paper
    Publication number: 20080295983
    Abstract: The invention relates to an optically variable security paper for the production of documents of value which comprises a cellulose-containing substrate which comprises core/shell particles, to processes for the production of a security paper of this type and to the use thereof for the production of documents of value.
    Type: Application
    Filed: September 20, 2006
    Publication date: December 4, 2008
    Inventors: Burkhard Krietsch, Matthias Kuntz, Holger Winkler
  • Security Paper Comprising Windows
    Publication number: 20080251222
    Abstract: The invention relates to a security paper for the production of documents of value which comprises a flat cellulose-containing substrate with a polymeric window included therein, to processes for the production of a security paper of this type and to the use thereof for the production of documents of value.
    Type: Application
    Filed: September 20, 2006
    Publication date: October 16, 2008
    Inventors: Burkhard Krietsch, Matthias Kuntz, Holger Winkler
  • Metallic ink, and use thereof for improving prints
    Publication number: 20070022901
    Abstract: Liquid or pasty metallic printing inks which contain a mixture of at least one metal effect pigment and at least one partly optically transparent effect pigment and are used for finishing prints.
    Type: Application
    Filed: May 10, 2004
    Publication date: February 1, 2007
    Applicants: XSYS Print Solutions Deutschland GmbH, Merck Patent GmbH
    Inventors: Ulrich Kurze, Peter Schlichting, Thomas Leuschner, Uwe Baz, Burkhard Krietsch
  • Dual security mark
    Publication number: 20070006127
    Abstract: The invention relates to a flat dual security feature which comprises two different security components, one of which can be verified in the visible spectral region and one of which can be verified in the ultraviolet spectral region of light, and which comprises flake-form effect pigments and luminescent pigments in such a low concentration that the latter are evident to the naked eye as individual particles under the action of UV light; to a process for the production thereof, and to the use thereof.
    Type: Application
    Filed: April 30, 2004
    Publication date: January 4, 2007
    Inventors: Matthias Kuntz, Burkhard Krietsch, Andreas Walter
  • Laser marking of documents of value
    Publication number: 20060141391
    Abstract: Disclosed are laser markings on a document of value and methods of preparing the same which are based on the interaction of the laser radiation with the printing-ink employed.
    Type: Application
    Filed: November 30, 2005
    Publication date: June 29, 2006
    Inventors: Sylke Klein, Michael Weiden, Wolfgang Kraas, Klaus-Christian Ullmann, Burkhard Krietsch
  • Laser-markable plastics
    Patent number: 6521688
    Abstract: The present invention relates to laser-markable plastics, in particular thermoplastic polyurethanes, which are distinguished by the fact that they contain pigments having a coating of doped tin dioxide.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: February 18, 2003
    Assignees: Merck Patent Gesellschaft mit beschrankter Haftung, BASF Aktiengesellschaft
    Inventors: Rainer Linzmeier, Burkhard Krietsch, Frank Prissok
  • Electrophotographic dry toner comprising angle-dependent luster pigments
    Publication number: 20020192585
    Abstract: The invention relates to a dry toner for laser printing which comprises at least one viewing angle-dependent (“angle-dependent”), platelet-shaped luster pigment. The luster pigment consists of a multicoated, platelet-shaped, opaque or semi-transparent substrate. The toner is particularly suitable for security printing. The invention furthermore relates to a process for the production of images by electrophotographic methods using the dry toner.
    Type: Application
    Filed: May 20, 2002
    Publication date: December 19, 2002
    Applicant: Merck Patent GmbH
    Inventors: Gunter Brenner, Hans-Dieter Bruckner, Wolfgang Hechler, Burkhard Krietsch, Matthias Kuntz, Michael Schmelz
  • Laser-markable plastics
    Patent number: 6214917
    Abstract: The present invention relates to laser-markable plastics, in particular thermoplastic polyurethanes, which are distinguished by the fact that they contain pigments having a coating of doped tin dioxide.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: April 10, 2001
    Assignees: Merck Patent GmbH, BASF Akteingesellschaft
    Inventors: Rainer Linzmeier, Burkhard Krietsch, Frank Prissok