Method for forming artificially and rapidly patina on copper, products thereof and solutions therefor
CA 2045919 A1 · Owner: Fumigation Maritime Ltee · Inventors: Gervais, Jocelyn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for artificially forming patina on copper comprising: a) removing any impurity present on the surface of copper substrate; b) polishing the copper substrate with an aqueous solution containing sodium ions copper ions, acetate ions, chlorine ions sulphate ions, H+ ions and an, OH- ions until a brown colour is obtained; c) washing the polished copper substrate having brown colour of step (b) with water and drying; d) gently brushing the copper substrate having been dried according to step (c) washing, and thoroughly drying; e) submitting the copper substrate after having been thoroughly dried according to step (d) to, a filtered aqueous solution containing copper carbonate ammonium …
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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
- Filed June 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2013.
- 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
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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.