System for treating polluted groundwater
CA 2133968 C · Owner: Gillham, Robert Winston · Inventors: Vales, Enoch Sam; Cherry, John Anthony; Gillham, Robert Winston
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Contaminated groundwater is treated in-situ by funnelling the water through a , gate or gates (23) in a watertight in-ground wall (18). Treatment material in the gate (23) breaks down the contaminant or , otherwise removes the contaminant from the flowing water. A removable caisson is first driven into the ground excavated, and , then a receptacle, for the treatment material is low-, ered into the hollow interior.
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 23, 1993 and granted July 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2015.
- 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.