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:
Jun. 16, 2015
Filed:
Feb. 23, 2011
Applicant:
Dario Narducci, Milan, IT;
Inventor:
Dario Narducci, Milan, IT;
Assignee:
AGERE S.R.L., Como, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C 22/48 (2006.01); C23C 22/83 (2006.01); C23F 11/16 (2006.01); B05D 1/18 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01); C23C 22/02 (2006.01); C23C 22/58 (2006.01); B05D 3/04 (2006.01);
U.S. Cl.
CPC ...
C23F 11/161 (2013.01); B05D 1/185 (2013.01); B05D 3/0486 (2013.01); B05D 2202/40 (2013.01); B05D 2350/63 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C23C 22/02 (2013.01);
Abstract
A method for protecting silver and silver alloy surfaces against tarnishing, characterized by initially subjecting the surface to be treated to cleaning pre-treatment in organic solvents; immersing the cleaned surface in an acid solution able to ensure formation of a thin layer of silver oxide; immersing the oxidized surface in a solution of at least one thiol of formula CH(CH)SH where n is between 10 and 16; and chemically reacting the molecules of said thiol with the previously oxidized silver surface, in an environment containing water vapor at a temperature of at least 50° C.