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:
Jul. 31, 1990
Filed:
May. 18, 1988
Bernd Langner, Winsen/Luhe, DE;
Rene-Holger Wilde, Badendorf, DE;
Norddeutsche Affinerie Aktiengesellschaft, Hamburg, DE;
Abstract
A process of producing blue copper hydroxide, wherein copper metal is treated with an ammonium ion-containing aqueous solution with stirring and with a simultaneous introduction of an oxygen-containing gas and the reaction product is separated from the copper metal. A particulate, floatable copper (II) hydroxide is produced in that a material which contains copper metal is treated at a temperature of 0.degree. to 40.degree. with a solution which contains 0.1 to 10 g/l ammonium salt (calculated as NH.sub.4), 0 to 10 g/l ammonium hydroxide (calculated NH.sub.3) and, if desired, 0 to 5 g/l copper (II) salt and the resulting copper (II) hydroxide is separated.