Metal stripping composition and process
CA 1196560 A · Owner: Omi International Corporation · Inventors: Somers, Gerardus A.; Hendriks, Jan J.M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a chemical stripping solution suitable for removing tin and tin-lead alloys from metallized e.g. copper coated, substrates so as to leave the substrate reusable, comprising an aqueous solution of hydrogen peroxide in an amount of 0.1 to 10 molar, ammonium bifluoride or ammonium fluoride in an amount of 0.4 to 10 molar an acid, in an amount such as to maintain the pH of the solution at the surface being stripped below the value at which smut formation occurs whereby effective stripping is achieved in use, and a metal complexing compound in an amount of at least 0.005 molar. The metal complexing compound comprises an 8-hydroxyquinoline compound and the molar ratio of …
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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
- Granted November 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2002.
- 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.