Corrosion inhibitor and method of use
CA 2062894 C · Owner: Exxon Chemical Patents Inc. · Inventors: Looney, James Robert; Williams, Dennis Alexander; Holifield, Phyllis Kay
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition and a method for treating wells having metal tubulars therein are disclosed, which composition comprises; (a) an aqueous acid solution;, (b) first metal ions selected from the group consisting of Sb, Bi, Cu (cuprous), and mixtures thereof;, (c) second metal ions selected from the group consisting of Ca, Mg, Al, Zn, Zr, Sn, and mixtures thereof, the mole ratio of the first metal ions to the second metal ions ranging from 1:10 to 10:1; (d) one or more quaternary aromatic ammonium compounds complexed with each of the first and second metal ions, the concentration of the quaternary ammonium compound and the metal ions complexed therewith ranges from 0.1 to 10 weight % of the …
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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 March 12, 1992 and granted July 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.
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.