Bore hole safety valves
CA 2272679 A1 · Owner: Head, Philip · Inventors: Head, Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A safety valve and pump apparatus has an electric pump a safety valve, a, packing means, a continuous length of tubing extending from the surface to the location of the safety valve and pump a control means provided to, operate the safety valve and the pump and a transmission means disposed, along the tubing to transmit signals from the control means to the safety valve and the pump. The tubing, the safety valve and the pump are all being concentrically aligned. Ideally, the tubing is coiled tubing and the, transmission means includes an electric cable. The electric pump is releasably attached to the safety valve by pump connection means so that, the pump may be disconnected from the …
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 25, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 25, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 25, 2021.
- 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.