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. 30, 2002
Filed:
Jan. 10, 2001
Bernd Mayer, Duesseldorf, DE;
Peter Kuhm, Hilden, DE;
Pietro Balboni, Bologna, IT;
Markus Senner, Duesseldorf, DE;
Horst-Dieter Speckmann, Langenfeld, DE;
Juergen Geke, Duesseldorf, DE;
Jan-Willem Brouwer, Willich, DE;
Annette Willer, Neuss, DE;
Henkel Kommanditgesellschaft auf Aktien, Duesseldorf, DE;
Abstract
An acidic aqueous phosphating solution is presented having 0.2 to 3 g/l of zinc ions, 3 to 50 g/l of phosphate ions expressed as PO , and 0.05 to 4 g/l of an organic N-oxide containing a saturated, unsaturated or aromatic 5- or 6-membered ring system, where the N atom of the N-oxide is part of said ring system, and where the ratio by weight of phosphate ions to zinc ions is from 3.7 to 30:1. The solution is free of hydroxylamine and useful in phosphating metal surfaces.