Visible dried-in-place non-chrome polyacrylamide based treatment for aluminum
CA 2116788 A1 · Owner: Betz Laboratories, Inc. · Inventors: Ouyang, Jiangbo; Deck, Philip D.; Harpel, William L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of providing color to a dried-in-place non-chromate, conversion coating is provided. The addition of a phthalo green pigment and optionally a nonionic surfactant to an aqueous dried-in-place, conversion coating treatment solution provides for a colored conversion coating without adversely affecting the corrosion resistance or adhesion properties of the conversion coating.
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 March 2, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 2, 2016.
- 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.