A water detention system incorporating a composite drainage membrane
CA 2597382 C · Owner: Hanson Building Products Ltd · Inventors: Hart, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water detention system comprises a sub-base of crushed rock or stone (21) overlying an impermeable layer (29) which may be naturally-occurring as in an , impermeable sub-grade, or may be formed by an impermeable membrane (26) laid over the sub-grade prior to the sub-base layer. Over the sub-base layer is an incompletely impermeable layer (22) the impermeability of which is compromised by openings in the form of slits (12) or by spacing between adjacent strips forming the layer. These openings allow water to percolate downwardly through the layer (22) into the sub-base, but substantially inhibit the escape of moisture by evaporation thereby serving to retain the collected water. …
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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 9, 2006 and granted October 13, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 9, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.