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:
Apr. 01, 2008
Filed:
Mar. 22, 2005
Kai Schumacher, Hofheim, DE;
Naruyasu Ishibashi, Yokkaichi, JP;
Hitoshi Kobayashi, Yokkaichi, JP;
Paul Brandl, Yokkaichi, JP;
Kai Schumacher, Hofheim, DE;
Naruyasu Ishibashi, Yokkaichi, JP;
Hitoshi Kobayashi, Yokkaichi, JP;
Paul Brandl, Yokkaichi, JP;
Degussa AG, Duesseldorf, DE;
Abstract
Pyrogenically produced silicon dioxide powder in the form of aggregates of primary particles having a BET surface area of 300±25 m/g, wherein the aggregates display an average surface area of 4800 to 6000 nm, an average equivalent circle diameter (ECD) of 60 to 80 nm and an average circumference of 580 to 750 nm. It is produced by a pyrogenic process in which silicon tetrachloride and a maximum of up to 40 wt. % of a second silicon component comprising HSiCl, HSiCl, HSiCl, CHSiCl, (CH)SiCl, (CH)SiCl and/or (n-CH)SiClare mixed with primary air and a combustion gas and burnt into a reaction chamber, secondary air also being introduced into the reaction chamber, and the feed materials being chosen such that an adiabatic flame temperature of 1390 to 1450° C. is obtained. It can be used as a filler.