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. 06, 1977
Filed:
Oct. 15, 1976
Manfred Ohlinger, Frankenthal, DT;
Eduard Schoenafinger, Ludwigshafen, DT;
Guenter Vaeth, Limburgerhof, DT;
Heinz Stritzinger, Ludwigshafen, DT;
Eberhard Koester, Frankenthal, DT;
Hans Henning Schneehage, Mutterstadt, DT;
Werner Steck, Mutterstadt, DT;
BASF Aktiengesellschaft, Ludwigshafen, DT;
Abstract
Goethite is obtained by reacting an aqueous solution of an iron (II) salt with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting iron(II) hydroxide. The oxidation is carried out in three stages. In the first stage, from 4 to 15% by weight are oxidized in the course of from 0.4 to 5 hours, in the second stage from 60 to 85% by weight are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount of iron is oxidized.