Explosive arrangements
CA 2090158 A1 · Owner: Eev Limited · Inventors: Cook, Graham M.; Hackney, Peter J.; Hackney, Peter J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
Explosive Arrangement An explosive arrangement includes an explosive charge 22 which is detonated simultaneously from each end to produce opposing detonation fronts in the explosive. When the fronts meet, an outward force results which is used, for example, to cut through drills which have become jammed in a bore hole. The simultaneous detonations are produced by transmitting an electrical pulse along a stripline 35 via two EFI initiators 33 and 34 connected electrically in series by the stripline. An end plate 32 is located adjacent to one end of the charge 22, being clamped in use on a central shaft 24. The end plate 32 is movable to allow variable lengths of charge to be used. Another …
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.
Why it's free to use
- Filed February 23, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 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.