Prepacked flush joint well screen
CA 2280916 A1 · Owner: Ameron International Corporation · Inventors: Johnson, Russell P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A prepacked well screen has concentric inner (10) and outer (11) fiber reinforced composite tubes with a granular filter medium (13) in the annulus between the inner (10) and outer (11) tubes. The walls of the tubes are slotted (12) for passing fluid through the slots (12) and the filter medium (13). Each end of the inner tube (10) extends beyond the adjacent end of the outer tube (11) and has a male thread (16). A connection is made to an adjacent well screen or other tube by a female coupling member (18) threaded onto the male thread (16). An advantage of the design is that the coupling member (18) connected to the inner tube (10) has an outside diameter approximately the same as …
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 February 6, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 6, 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.