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:
Mar. 24, 2015
Filed:
Jul. 03, 2009
Anne-laure Pinault, Antony, FR;
Joël Racinoux, Rochetaillée sur Saône, FR;
Petro Pechkurov, Kiev, UA;
Anne-Laure Pinault, Antony, FR;
Joël Racinoux, Rochetaillée sur Saône, FR;
Petro Pechkurov, Kiev, UA;
Rhodia Operations, Aubervilliers, FR;
Abstract
A method for preparing precipitated silica includes the reaction of sodium metabisulfite or sodium sulfite with sand, wherein a) sand is mixed with sodium metabisulfite or sodium sulfite; b) the mixture thus obtained is melted to produce solid sodium silicate and sulfurous anhydride; c) the solid sodium silicate is dissolved in water to provide a sodium silicate aqueous solution, d) the sulfurous anhydride is reacted with the sodium silicate aqueous solution to provide a mixture containing precipitated silica; and e) the precipitated silica is separated from said mixture.