Composition and method for stripping tin or tin-lead alloy from copper surfaces
CA 2007608 C · Owner: Letize, Raymond A. · Inventors: Lane, Karl; Cordani, John L.; Biran, Zvi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A 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, and an inorganic nitrate preferably, ferric nitrate. The composition effects stripping without any appreciable formation of sludge or precipitate or suspended particles.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 11, 1990 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 11, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.