Patents by Inventor Michael Kröll

Michael Kröll 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).

  • Publication number: 20090230347
    Abstract: Formulation comprising a polymerizable monomer and/or a polymer and, dispersed therein, a superparamagnetic powder, which comprises aggregated primary particles, the primary particles being built up from magnetic metal oxide domains having a diameter of from 2 to 100 nm in a nonmagnetic metal oxide or metalloid oxide matrix. Process for heating the formulation in a magnetic or electromagnetic alternating field. Use of the formulation as an adhesive composition.
    Type: Application
    Filed: November 29, 2005
    Publication date: September 17, 2009
    Applicant: DEGUSSA GmbH
    Inventors: Markus Pridöhl, Guido Zimmermann, Michael Kröll, Harald Häger
  • Publication number: 20090214866
    Abstract: Process for the production of a metal oxide powder having a BET surface area of at least 20 m2/g by reacting an aerosol with oxygen in a reaction space at a reaction temperature of more than 700° C. and then separating the resulting powder from gaseous substances in the reaction space, wherein the aerosol is obtained by atomisation using a multi-component nozzle of at least one starting material, as such in liquid form or in solution, and at least one atomising gas, the volume-related mean drop diameter D30 of the aerosol is from 30 to 100 ?m and the number of aerosol drops larger than 100 ?m is up to 10%, based on the total number of drops, and metal oxide powder obtainable by this process.
    Type: Application
    Filed: February 19, 2009
    Publication date: August 27, 2009
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Stipan KATUSIC, Michael Kraemer, Michael Kroell, Peter Kress, Edwin Staab
  • Patent number: 7553465
    Abstract: Cerium oxide powder having carbonate groups and made of crystalline primary particles containing cerium oxide and having carbonate groups on the surface and in a region close to the surface, and having a BET surface area of from 25 to 150 m2/g, a mean diameter of from 5 to 50 nm, a carbonate concentration in the region close to the surface decreasing inwardly from the surface, a carbon content due to carbonate groups on the surface of from 5 to 50% by area, a carbon content due to carbonate groups at a depth of about 5 nm in a region close to the surface of from 0 to 30% by area, a content of cerium oxide calculated as CeO2 and based on the powder of at least 99.5% by weight and a content of organic and inorganic carbon of from 0.01 to 0.3% by weight. A dispersion containing this powder.
    Type: Grant
    Filed: August 11, 2006
    Date of Patent: June 30, 2009
    Assignee: Degussa AG
    Inventors: Stipan Katusic, Michael Kroell, Michael Kraemer, Stefan Heberer, Edwin Staab, Guenther Michael
  • Publication number: 20090136757
    Abstract: A method of fractionating a dispersion of oxidic nanoparticles wherein at least one step of the method is a membrane crossflow filtration step, the flow of the dispersion over the membrane being brought about by means of driven rotating parts; and dispersions of oxidic nanoparticles that are obtainable by the method.
    Type: Application
    Filed: November 14, 2008
    Publication date: May 28, 2009
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Roland WURSCHE, Goetz Baumgarten, Wolfgang Lortz, Michael Kroell
  • Patent number: 7510693
    Abstract: Process for the production of a metal oxide powder having a BET surface area of at least 20 m2/g by reacting an aerosol with oxygen in a reaction space at a reaction temperature of more than 700° C. and then separating the resulting powder from gaseous substances in the reaction space, wherein the aerosol is obtained by atomisation using a multi-component nozzle of at least one starting material, as such in liquid form or in solution, and at least one atomising gas, the volume-related mean drop diameter D30 of the aerosol is from 30 to 100 ?m and the number of aerosol drops larger than 100 ?m is up to 10%, based on the total number of drops, and metal oxide powder obtainable by this process.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: March 31, 2009
    Assignee: Degussa AG
    Inventors: Stipan Katusic, Michael Kraemer, Michael Kroell, Peter Kress, Edwin Staab
  • Patent number: 7365101
    Abstract: A dispersion of pyrogenically produced cerium oxide, which does not contain any particles larger than 1 ?m, is produced by dispersing a pyrogenically produced cerium oxide in water by means of a dissolver, centrifuging it, separating the supernatant from the bottom product, and again dispersing the supernatant by means of ultrasound. The dispersion can be used for chemical-mechanical polishing (CMP).
    Type: Grant
    Filed: September 15, 2004
    Date of Patent: April 29, 2008
    Assignee: Degussa AG
    Inventors: Michael Kröll, Günther Michael, Rainer Hahn, Stipan Katusic, Stefan Heberer, Ralph Brandes
  • Patent number: 7264787
    Abstract: Polycrystalline cerium oxide powder in the form of aggregates of primary particles with a specific surface of between 70 and 150 m2/g, an average primary particle diameter of between 5 and 20 nm and an average, projected aggregate diameter of between 20 and 100 nm. It is produced in that an aerosol is reacted in a flame obtained from a hydrogen-containing combustible gas and primary air and the solid obtained is then separated from the gaseous substances.
    Type: Grant
    Filed: July 12, 2004
    Date of Patent: September 4, 2007
    Assignee: Degussa AG
    Inventors: Stipan Katusic, Stefan Heberer, Michael Kraemer, Peter Kress, Michael Kroell, Edwin Staab
  • Publication number: 20070149395
    Abstract: Composite particles useful for absorbing in the UV-A and UV-B regions contain a zinc oxide matrix and cerium oxide domains, wherein the domains are located in and on the matrix, wherein a fraction of zinc oxide is 80 to 98% by weight and a fraction of cerium oxide is 2 to 20% by weight, in each case based on the composite particles, and wherein a BET surface area of said composite particles is from 5 to 100 m2/g.
    Type: Application
    Filed: December 13, 2006
    Publication date: June 28, 2007
    Applicant: DEGUSSA AG
    Inventors: Michael Kroell, Stipan Katusic, Guido Zimmermann, Stefan Heberer
  • Publication number: 20070048205
    Abstract: Cerium oxide powder having carbonate groups and made of crystalline primary particles containing cerium oxide and having carbonate groups on the surface and in a region close to the surface, and having a BET surface area of from 25 to 150 m2/g, a mean diameter of from 5 to 50 nm, a carbonate concentration in the region close to the surface decreasing inwardly from the surface, a carbon content due to carbonate groups on the surface of from 5 to 50% by area, a carbon content due to carbonate groups at a depth of about 5 nm in a region close to the surface of from 0 to 30% by area, a content of cerium oxide calculated as CeO2 and based on the powder of at least 99.5% by weight and a content of organic and inorganic carbon of from 0.01 to 0.3% by weight. A dispersion containing this powder.
    Type: Application
    Filed: August 11, 2006
    Publication date: March 1, 2007
    Applicant: DEGUSSA AG
    Inventors: Stipan Katusic, Michael Kroell, Michael Kraemer, Stefan Heberer, Edwin Staab, Guenther Michael
  • Publication number: 20060193764
    Abstract: Process for the production of a metal oxide powder having a BET surface area of at least 20 m2/g by reacting an aerosol with oxygen in a reaction space at a reaction temperature of more than 700° C. and then separating the resulting powder from gaseous substances in the reaction space, wherein the aerosol is obtained by atomisation using a multi-component nozzle of at least one starting material, as such in liquid form or in solution, and at least one atomising gas, the volume-related mean drop diameter D30 of the aerosol is from 30 to 100 ?m and the number of aerosol drops larger than 100 ?m is up to 10%, based on the total number of drops, and metal oxide powder obtainable by this process.
    Type: Application
    Filed: January 30, 2006
    Publication date: August 31, 2006
    Applicant: Degussa AG
    Inventors: Stipan Katusic, Michael Kraemer, Michael Kroell, Peter Kress, Edwin Staab
  • Publication number: 20050036928
    Abstract: Polycrystalline cerium oxide powder in the form of aggregates of primary particles with a specific surface of between 70 and 150 m2/g, an average primary particle diameter of between 5 and 20 nm and an average, projected aggregate diameter of between 20 and 100 nm. It is produced in that an aerosol is reacted in a flame obtained from a hydrogen-containing combustible gas and primary air and the solid obtained is then separated from the gaseous substances.
    Type: Application
    Filed: July 12, 2004
    Publication date: February 17, 2005
    Applicant: DEGUSSA AG
    Inventors: Stipan Katusic, Stefan Heberer, Michael Kraemer, Peter Kress, Michael Kroell, Edwin Staab