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:
Feb. 22, 2005
Filed:
Dec. 21, 2000
Paolo B. Giordani, Crema, IT;
Valentino Gasparetto, Olgiate Molgora, IT;
Dario Negri, Bagnolo Cremasco, IT;
Paolo B. Giordani, Crema, IT;
Valentino Gasparetto, Olgiate Molgora, IT;
Dario Negri, Bagnolo Cremasco, IT;
Henkel Kommanditgesellschaft auf Aktien (Henkel KGAA), Duesseldorf, DE;
Abstract
A chromium- and nitrogen-free brightening and passivating treatment for metal surfaces, particularly iron and steel, comprises: at least one acid; at least one substance containing a peroxy moiety; and at least one organic substance selected from the group consisting of; molecules that contain both at least one ether moiety and at least one hydroxyl moiety; molecules that contain at least two ether moieties; and molecules that contain in each molecule both at least one ether moiety and one nitrogen atom that is covalently bonded to at least three carbon atoms. Preferably part of the acid contains phosphorus, which has been found to act synergistically with the organic substance to stabilize peroxy compounds against decomposition, particularly in the presence of metal ions.