Reinflatable external casing packer and method of casing
CA 2082232 A1 · Owner: Berzin, Vel · Inventors: Berzin, Vel; Abarca, John R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
DOCKET NO.2944436-US, ABSTRACT OF THE DISCLOSURE The present invention is directed to a reinflatable external casing packer which is operable in three modes including: a filling mode of, operation a locking mode of operation, and a reinflation mode of operation. A valve system is provided which allows for selective filling and reinflation ofthe external casing packer in response to suspected or detected loss of pressure within the inflation chamber. The present invention may also be characterized as a method of placing a wellbore.
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 November 5, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 5, 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.