The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 13, 2008
Filed:
Sep. 02, 2004
Stipan Katusic, Kelkheim, DE;
Michael Kraemer, Schoeneck-Kilianstaedten, DE;
Peter Kress, Karlstein, DE;
Horst Miess, Kahl, DE;
Guido Zimmermann, Hanau, DE;
Peter Albers, Hanau, DE;
Stipan Katusic, Kelkheim, DE;
Michael Kraemer, Schoeneck-Kilianstaedten, DE;
Peter Kress, Karlstein, DE;
Horst Miess, Kahl, DE;
Guido Zimmermann, Hanau, DE;
Peter Albers, Hanau, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
Pyrogenically prepared zinc oxide powder having a BET surface area of from 10 to 200 m/g, which is in the form of aggregates, the aggregates being composed of particles having different morphologies, and 0-10% of the aggregates being in a circular form, 30-50% being in an ellipsoidal form, 30-50% being in a linear form and 20-30% being in a branched form. It is prepared by reacting a starting mixture containing zinc vapour, a combustible gas and steam or a mixture of steam and carbon dioxide in a flame with an oxygen-containing gas in an oxidation zone, cooling the hot reaction mixture in a quenching zone and separating the solid material from the gas stream, the amount of oxygen in the oxidation zone being greater than the amount necessary for the complete oxidation of the combustible gas and the zinc vapour. The zinc oxide powder can be used as a constituent of sun protection compositions for protection against UV radiation.