Method of forming corrosion inhibitng films with hydrogenated benzotriazole derivatives
CA 2312386 A1 · Owner: Gill, Jasbir S. · Inventors: Pilsits, John P.; Cognetti, Ann M.; Gill, Jasbir S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of use of a composition including either or both isomers of hydrogenated methylbenzotriazole, namely 5-Methyl-1H-Benzotriazole or 4-, Methyl-1H-Benzotriazole which have been at least about 50 % hydrogenated to , form corrosion inhibiting films on metal surfaces in an aqueous environment. The hydrogenated methylbenzotriazole compositions provide both improved passivation and improved film persistence when charged to aqueous industrial systems either on a continuous or on an intermittent basis. Continuous dosing is generally kept at a constant 0.5, typically 1-2 ppm in the aqueous system to be treated; intermittent doses are generally 10-20 ppm once every week or two or more. …
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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 November 4, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2020.
- 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.