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. 17, 2012
Filed:
Oct. 22, 2010
Norikazu Sugaya, Yamanashi, JP;
Norikazu Sugaya, Yamanashi, JP;
Kitz Corporation, Chiba, JP;
Abstract
This invention relates to a plumbing device made of a copper alloy containing nickel salt, that includes a valve and a tube coupling having at least a liquid-contacting part washed with a cleaning fluid incorporating therein nitric acid and hydrochloric acid as an inhibitor under conditions of a temperature and a duration permitting effective removal of nickel salt, thereby performing nickel salt-removing treatment and causing the hydrochloric acid to form a coating film on the surface of the liquid-contacting part thereby effectively precluding elution of nickel salt from the surface of the liquid-contacting part in the presence of the coating film, wherein the nitric acid has a concentration c in a range of 0.5 wt %<c<7 wt % and the hydrochloric acid has a concentration d in a range of 0.05 wt %<d<0.7 wt % in the cleaning fluid, wherein the temperature is set to 10° C.≦x 50° C., and wherein nickel salt is removed with the cleaning fluid.