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:
Apr. 19, 1977
Filed:
Oct. 17, 1975
Applicant:
Inventor:
Jean Francois Paulet, Siblingen, CH;
Assignee:
Swiss Aluminium Ltd., Neuhausen am Rheinfall, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; C23F / ;
U.S. Cl.
CPC ...
148-627 ; 427436 ;
Abstract
The invention allows one to obtain a strongly adherent dark grey to black coating, with good corrosion resistance, on aluminium and its alloys. The degreased aluminum is pre-treated in an aqueous solution containing at least one salt of a metal which is less electronegative than aluminium. It is then colored in another aqueous solution containing molybdate ions and at least one fluorine compound and/or a heavy metal chloride, and/or an organic chlorine compound with active chlorine atoms.