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:
Nov. 28, 1995
Filed:
Feb. 08, 1995
Applicant:
Inventors:
Ingo F Litzenberger, Frankfurt am Main, DE;
Gunter Roller, Bad Homburg, DE;
Dieter Stein, Wiesbaden, DE;
Assignee:
Metallgesellschaft Aktiengesellschaft, Frankfurt, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25B / ;
U.S. Cl.
CPC ...
204 93 ;
Abstract
An aqueous ammonium alum solution which contains Fe.sup.3+ ions and has a pH not in excess of 5 is passed through at least one half of the Fe.sup.3+ ions in the solution to Fe.sup.2+ ions. The solution is cooled and ammonium alum is crystallized whereas the Fe.sup.2+ ions remain in the liquid phase.