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. 08, 1980
Filed:
Mar. 13, 1979
Gerhard Usbeck, Wiesbaden, DE;
Hoechst Aktiengesellschaft, , DE;
Abstract
This invention relates to an improvement in the process for anodically oxidizing materials in the form of strips, foils, or plates comprised of aluminum or aluminum alloys in an aqueous electrolyte containing sulfuric acid and aluminum ions, if appropriate, after a foregoing mechanical, chemical, or electrochemical roughening, the improvement comprising anodically oxidizing the material in an electrolyte having a concentration of sulfuric acid in the range of about 25 to 100 g per liter and of aluminum ions in the range of about 10 to 25 g per liter, at a current density in the range of about 4 to 25 A/dm.sup.2, and a temperature in the range of about 25.degree. to 65.degree. C.