Creating and controlling an artificial water table
CA 1214046 A · Owner: Vidal, Stephen P. Jr. · Inventors: Vidal, Stephen P. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The installation includes a watertight membrane (20) that lines a basin excavated in the earth. A ballast layer (34) of generally uniform size rock is laid on top of the watertight membrane in the basin and the ballast layer is extremely permeable by water. The ballast layer is covered by a permeable membrane (36) such as cloth. The permeable membrane is, in turn, covered by a layer (38) of finely divided particles such as crushed volcanic ash or cinders. The particles of this fine layer are prevented from pentrating the ballast layer by the permeable membrane. The fine layer permits water to diffuse through it by capillary action. The fine layer is topped by a finish layer (40) which is …
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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
- Granted November 18, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 18, 2003.
- 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.