Filter apparatus for use in water wells
CA 2423766 A1 · Owner: Buckner, A. Wayne (Deceased) · Inventors: Buckner, A. Wayne (Deceased); Parris, Daniel M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention generally provides a wellscreen for use in water wells. In one aspect of the invention, the wellscreen includes a perforated base pipe (31), an inner wrap (32) and an outer wrap (34) with a filter material (36) packed in an annular area therebetween. The filter material provides additional filtering of fluids passing therethrough and also makes the wellscreen more resistant to collapse.
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 7, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 7, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 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.