Methods and compositions for coating non-ferrous metals
CA 2044503 A1 · Owner: Dykstra, Kenneth A. · Inventors: Dykstra, Kenneth A.; Muller, Frank A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Promotion of paint adhesion and corrosion resistance on the surface of a non-ferrous metal such as aluminum by contact with an aqueous acidic solution containing an anionic polyacrylic/polyacrylamide copolymer ammonium, zirconium fluoride, nitric acid and water.
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 June 13, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 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
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.