Methods and emulsions for inhibition of oil well corrosion
CA 2237271 C · Owner: Mullen, John P. · Inventors: Martin, Richard L.; Braga, Thomas G.; Mullen, John P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel method for inhibiting oxygen corrosion in an oil well and an emulsion , useful therein. The method comprises introducing into the well a pourable emulsion comprising about 50 to about 95 volume percent discontinuous aqueous phase, about 5 to about 50 volume percent continuous oil phase and a , corrosion inhibiting amount of a composition comprising a corrosion inhibitor selected from among thiophosphates containing both oxygen and sulfur pyrophosphates containing both oxygen and sulfur and mixtures thereof.
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 September 6, 1996 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 6, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 6, 2018.
- 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.