Expandable well screen
CA 2346441 A1 · Owner: Echols, Ralph H. · Inventors: Gano, John C.; Castano-Mears, Ana M.; Echols, Ralph H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An expandable well screen provides increased collapse torsional and, tensile strength. In a described embodiment an expandable well screen , includes, a generally tubular base pipe and an external filtering media. The well screen is, configured to have sufficient torsional and tensile strength for conveyance and, positioning in a wellbore, while also having sufficient strength to prevent collapse, when the screen is radially expanded.
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 4, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 4, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 4, 2023.
- 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.