Polymeric compositions and method for use in low temperature well applications
CA 2236734 A1 · Owner: Halliburton Energy Services, Inc. · Inventors: Funkhouser, Gary P.; Frost, Keith A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to improved methods and compositions for performing well completion or remedial procedures in subterranean zones having temperatures below about 70°F. The methods, basically comprise the steps of introducing into the zone an aqueous solution of a polymerizable monomer, a polymerization initiator and an oxygen scavenger comprised of stannous chloride. Thereafter the, polymerizable monomer is allowed to polymerize in the zone. The stannous chloride scavenges oxygen without generating free radicals and causing premature polymerization.
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 May 5, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 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.