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:
Aug. 19, 2014
Filed:
Feb. 13, 2012
Michael Vössing, Bochum, DE;
Auer Gerhard, Krefeld, DE;
Benno Laubach, Krefeld, DE;
Detlef Klein, Krefeld, DE;
Werner Schuy, Tönisvorst, DE;
Klaus Köllisch, Krefeld, DE;
Erwin Weiss, Kriftel, DE;
Werner Bahl, Recklinghausen, DE;
Philip Reese, Nelson, NZ;
Michael Vössing, Bochum, DE;
Auer Gerhard, Krefeld, DE;
Benno Laubach, Krefeld, DE;
Detlef Klein, Krefeld, DE;
Werner Schuy, Tönisvorst, DE;
Klaus Köllisch, Krefeld, DE;
Erwin Weiss, Kriftel, DE;
Werner Bahl, Recklinghausen, DE;
Philip Reese, Nelson, NZ;
Crenox GmbH, Krefeld, DE;
Abstract
The invention relates to a reducing agent for the soluble chromate content of cement and to methods for the production thereof, which comprise concentrating an used sulfuric acid, containing iron (II) sulfate, and separating the sulfuric acid from the obtained precipitate which contains iron (II) sulfate.