Apparatus and method for liquefaction remediation of liquefiable soils
CA 2250989 C · Owner: Goughnour, R.Robert · Inventors: Goughnour, R.Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Liquefiable soil (10) is treated for earthquake liquefaction for a building structure or work (11) on or below an overlying ground surface. A plurality of substantially vertical prefabricated drains (12) are positioned at spaced intervals in the liquefiable soil (10) and a reservoir (14) is provided and adapted for draining off water which is expelled from the drains (12) during an earthquake. The drains (12) are generally comprised of an elongated plastic core material providing channels for channeling water off or therealong and this core is sometimes or selectively surrounded by a filter fabric as required to provide a composite drain.
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 April 8, 1997 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 8, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 2019.
- 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.