Downhole apparatus
CA 2365331 A1 · Owner: Weatherford/Lamb, Inc. · Inventors: Mchardy, Colin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Downhole apparatus (10) comprises a body (12) for mounting on a tubular string, the body (12) defining an internal bore. A fluid pressure actuated valve member (14) is movable relative to the body (12) and a normally closed flow port (18) is provided in the valve member (14). With the valve member (14) in a first position relative to the body (12) the port (18) is closed and with the valve member (14) in a second position the port (18) is open to permit fluid communication therethrough between the body bore and the exterior of the body. The valve member (14) is biassed towards the first position. A fluid pressure actuated latch arrangement (44) releasably retains the valve member …
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 March 8, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 8, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 2022.
- 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.