Blasting
CA 2541340 C · Owner: Skaggs, Roger Dean · Inventors: Heinke, Nils Alberto; Skaggs, Roger Dean; Collinsworth, Stephen Mitchell
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
In blasting rock, a drill hole (12) is charged with spaced composite layers , (20), (30, 40) at different levels between an open mouth (14) and a blind bottom (16). Each composite layer is supported on a plug (22 32, 42). , Flowable plunger material (24 34, 44), e.g. drill cuttings, is supported on the respective plug followed by blast material (26 36, 46), topped by a , further layer of plunger material (28 38, 48). The plunger material (48) at the top, is in the form of tamping. The composite layers are spaced respectively from one another and optionally from the bottom (16). Initiators , (27 37, 47) can be actuated by means of a controller to initiate the blasting material to …
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 September 30, 2004 and granted July 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 30, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 2026.
- 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.