Removing volatile organic compounds from groundwater
CA 2108128 A1 · Owner: Board Of Trustees Of The Leland Stanford Junior University (The) · Inventors: Gorelick, Steven M.; Gvirtzman, Haim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system and method for removing volatile organic compounds (VOCs) from groundwater. A compressor (18) injects gas into a well (10) through a gas line (16) to cause rising bubbles and a water flow toward and up the well (10). A water and bubble mixture (20) flows upward in an annular space (21). Water flows to an unsaturated zone (24) through a series of drains (25). A deflection plate (30) helps guide vapor to an extraction line (33) which ultimately leads to a vapor treatment device (34).
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 May 11, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2014.
- 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.