A well screen
CA 2570314 C · Owner: Kluger, Dieter Adolf · Inventors: Dowsett, Graeme John; Kluger, Dieter Adolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A well screen with a filter layer; a cylindrical outer stand-off layer around the filter layer, the cylindrical outer stand-off layer having a construction which is more rigid than a construction of the filter layer; and a collapsible outer cover around the outer stand-off layer said collapsible outer cover , having a construction which is less rigid than the construction of the outer stand-off layer; arranged such that the outer stand-off layer spaces the collapsible outer cover from the filter layer and also resists collapse of the cover towards the filter layer.
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 June 16, 2004 and granted August 20, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 16, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 2026.
- 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.