Method and apparatus for removing a liquid phase floating on surface of groundwater
CA 2028863 A1 · Owner: Bockle, Rudiger · Inventors: Bockle, Rudiger
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and Apparatus for Removing a Liquid Phase Floating on a Surface of Groundwater, In order to remove a liquid phase (7) floating on a surface of groundwater (6), the liquid level (18) in a well (1) is lowered by continually pumping out groundwater by means of a submergible pump (2). The floating liquid phase (7) thereby collecting on the groundwater surface (6) in the area of the well is withdrawn by a second submergible pump (12) arranged in a bucket-shaped vessel (8) which is adapted to be lowered in the well (1) by means of a lifting device (9, 10). The lifting device (9, 10) is controlled by the liquid level (18) such that the inlet apertures (11) of the vessel (8) while being, …
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 March 16, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 2012.
- 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.