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:
Dec. 31, 2013
Filed:
May. 29, 2007
Christian Panz, Wesseling-Berzdorf, DE;
Helga Obladen, Bruehl, DE;
Rene Allerdisse, Bornheim, DE;
Karl Meier, Alfter, DE;
Markus Ruf, Alfter-Witterschlick, DE;
Michael Kempf, Rodenbach, DE;
Mario Scholz, Gruendau, DE;
Dieter Kuhn, Rodenbach, DE;
Christian Panz, Wesseling-Berzdorf, DE;
Helga Obladen, Bruehl, DE;
Rene Allerdisse, Bornheim, DE;
Karl Meier, Alfter, DE;
Markus Ruf, Alfter-Witterschlick, DE;
Michael Kempf, Rodenbach, DE;
Mario Scholz, Gruendau, DE;
Dieter Kuhn, Rodenbach, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
Hydrophilic precipitated silicas which combine a particularly low initial moisture content with low moisture absorption over time, a low tapped density and a low silanol group density, have the following physicochemical parameters: equilibrium moisture content (at 70% relative humidity/20° C.) of 0.5%-5.0% by weight, based on the weight of the hydrophilic precipitated silica, BET surface area of 50-250 m/g, CTAB surface area of 50-250 m/g, and DBP (anhydrous) of 200-350 g/100 g.