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:
May. 21, 1991
Filed:
Jul. 17, 1990
John L Cordani, Waterbury, CT (US);
MacDermid, Incorporated, Waterbury, CT (US);
Abstract
An aqueous composition for stripping tin or solder, as well as any underlying copper-tin alloy, from copper surfaces, containing an alkane sulfonic acid, preferably methane sulfonic acid, ferric nitrate, and a source of chlorate ion. The composition effects stripping without any appreciable formation of sludge or precipitate or suspended particles, and the chlorate component enables significant reduction in the concentration of alkane sulfonic acid otherwise needed for the stripping. Also described are stripping compositions containing a source of chlorate ion and an acid for solubilizing stripped tin or tin-lead, such as alkane sulfonic acid, acetic acid, formic acid and the like.