Positive displacement vacuum pumps
CA 2020030 A1 · Owner: Avramidis, Anestis S. · Inventors: Avramidis, Anestis S.; Avramidis, Anestis S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Well pumping system that uses pressurized air as power fluid and operates simultaneously as a positive displacement pump and as a gas lift pump, to pump well fluids intermitently; and also may be used in combination with fluid actuated pumping devices to pump well fluids continuously, extracting them by suction from the pores of a geologic formation through the screen of a monitoring well, as often is required for remediation purposes in hazardous wastes projects, or soil stabilization purposes in foundation engineering projects. Solid particles in the well fluids are filtered prior to entering the pumping system. Well fluids are separated from the pressurized air by passing the well …
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 June 28, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 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.