Corrosion inhibition in highly acidic environments by use of pyridine salts in combination with certain cationic surfactants
CA 2066797 A1 · Owner: Fahey, William F. · Inventors: Alink, Bernardus A. O.; Shah, Sayed S.; Fahey, William F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for inhibiting corrosion of ferrous surfaces in an acidic, aqueous medium is disclosed. The method comprises incorporating into the medium a corrosion-inhibiting amount of a pyridine salt composition (comprising a quaternary pyridine salt composition and/or a pyridine.HCL salt composition) and a cationic surfactant that forms a bilayer on the ferrous surfaces in the medium. Highly quaternized pyridine salt compositions useful in such method and a method for preparation of such compositions are also disclosed.
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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 April 22, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.