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:
Sep. 30, 2014
Filed:
Nov. 13, 2009
Stipan Katusic, Bad Soden, DE;
Harald Herzog, Karlstein, DE;
Peter Kress, Karlstein, DE;
Armin Wiegand, Grosskrotzenburg, DE;
Stipan Katusic, Bad Soden, DE;
Harald Herzog, Karlstein, DE;
Peter Kress, Karlstein, DE;
Armin Wiegand, Grosskrotzenburg, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
Iron-silicon oxide particles with a core-shell structure, which have a) a BET-surface area of 10 to 80 m/g, b) a thickness of the shell of 2 to 30 nm and c) a content of iron oxide of 60 to 90% by weight, of silicon dioxide of 10 to 40% by weight, based in each case on the enveloped particles, where d) the proportion of iron, silicon and oxygen is at least 99% by weight, based on the enveloped particles, and where e) the core is crystalline and the iron oxides comprise haematite, magnetite and maghemite, f) the shell consists of amorphous silicon dioxide and g) at least one compound or a plurality of compounds consisting of the elements silicon, iron and oxygen is/are present between shell and core.