Patents by Inventor Udo Holtmann

Udo Holtmann 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).

  • Preparation of red iron oxide pigment
    Patent number: 11104807
    Abstract: The present invention relates to an improved process for producing iron oxide red pigments by the Penniman process using nitrate (also referred to as nitrate process or direct red process) and apparatuses for carrying out the process.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: August 31, 2021
    Assignee: LANXESS Deutschland GmbH
    Inventors: Waldemar Czaplik, Udo Holtmann
  • PREPARATION OF RED IRON OXIDE PIGMENT
    Publication number: 20200299515
    Abstract: The present invention relates to an improved process for producing iron oxide red pigments by the Penniman process using nitrate (also referred to as nitrate process or direct red process) and apparatuses for carrying out the process.
    Type: Application
    Filed: March 8, 2017
    Publication date: September 24, 2020
    Applicant: LANXESS Deutschland GmbH
    Inventors: Waldemar CZAPLIK, Udo HOLTMANN
  • Method for producing finely divided haematite and for producing iron oxide red pigments
    Patent number: 9428402
    Abstract: The present invention relates to an improved process for the production of finely divided haematite and of iron oxide red pigments made up of the finely divided haematite and the use of the finely divided haematites and iron oxide red pigments produced by this process.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: August 30, 2016
    Assignee: LANXESS Deutschland GmbH
    Inventors: Guido Ketteler, Udo Holtmann, Juergen Kischkewitz
  • METHOD FOR PRODUCING FINELY DIVIDED HAEMATITE AND FOR PRODUCING IRON OXIDE RED PIGMENTS
    Publication number: 20140205664
    Abstract: The present invention relates to an improved process for the production of finely divided haematite and of iron oxide red pigments made up of the finely divided haematite and the use of the finely divided haematites and iron oxide red pigments produced by this process.
    Type: Application
    Filed: September 28, 2012
    Publication date: July 24, 2014
    Applicant: LANXESS DEUTSCHLAND GmbH
    Inventors: Guido Ketteler, Udo Holtmann, Juergen Kischkewitz
  • 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
  • Process for the preparation of pigment granules and the use thereof
    Publication number: 20080257213
    Abstract: The present invention relates to pigment granules and to a process for the preparation thereof and their use.
    Type: Application
    Filed: April 23, 2007
    Publication date: October 23, 2008
    Inventors: Holger Friedrrich, Kai Butje, Udo Holtmann
  • Process for the production of inorganically coated pigments and fillers
    Patent number: 5792250
    Abstract: This invention relates to a process for the production of inorganically coated pigments and fillers and to the use thereof.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: August 11, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf-Michael Braun, Jurgen Kischkewitz, Hilmar Rieck, Udo Holtmann
  • Process for the production of mixed oxide powders for catalysts for the removal of nitrogen oxides
    Patent number: 5723404
    Abstract: A process for the production of a mixed oxide powder, that contains as chief constituent TiO.sub.2 in the form of anatase and as minor constituents at least one of the catalytically active oxides MoO.sub.3, WO.sub.3 and V.sub.2 O.sub.5, suitable for use as a catalyst for the removal of nitrogen oxides, comprising(a) partially neutralizing a titanium dioxide hydrate suspension containing sulphuric acid with an alkaline liquor to a pH value between about 4.0 and 6.0 at temperatures between about 20.degree. and 100.degree. C.,(b) filtering the suspension from (a) to produce a filter cake and intensively washing the filter cake,(c) adding to the filter cake from (b) at least one water-soluble salt of at least one of the metals Mo, W and V in solid or dissolved form, and(d) drying the filter cake from (c) and calcining it at a temperature between about 300.degree. and 750.degree. C.
    Type: Grant
    Filed: May 16, 1996
    Date of Patent: March 3, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Kai Butje, Jurgen Kischkewitz, Rolf Michael Braun, Udo Holtmann, Peter-Joachim Barenthien
  • Process for the production of storable, free-flowing hydrated ferrous sulfate
    Patent number: 5268159
    Abstract: A process for the production of storable, free-flowing hydrated ferrous sulfate which comprises mixing moist ferrous sulfate heptahydrate and dried hydrated ferrous sulfate in such a ratio that a free-flowing and storable product is obtained.
    Type: Grant
    Filed: June 24, 1992
    Date of Patent: December 7, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventor: Udo Holtmann