Canadian application, no grantCanada
Method and apparatus for casing circulation and filling
CA 2083477 A1 · Owner: Haliburton Company · Inventors: Brisco, David P.; Mcguire, David D.; Brisco, David P.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cup-type seal circulating device or a compression type packer seal circulating device for use in running a string of casing into a well bore.
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 20, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 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.
FiledNovember 20, 1992
GrantedNo grant recorded
Term endedNovember 20, 2012
Patent numberCA 2083477 A1
Classification (IPC)E21B33/04 +2 more
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.