Activated stemming device
CA 2472533 A1 · Owner: Nxco International Limited · Inventors: Van Dyk, Andre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
Stemming apparatus which includes a member a propellant charge and an , initiator for igniting the propellant charge. Stemming (32) is placed into the hole (10) from the rock face (14) covering the cartridge to a desired extent. The stemming is consolidated by being tamped in position. A member (34) which , is made from a plastics materials such as polypropylene is then placed over , the stemming (32). The member has a conical leading end (36) which faces downwardly into the stemming and, in this example has a substantially planar , trailing end (38) which faces upwardly. The maximum diameter of the member (34) is slightly less than the nominal diameter of the hole (10). A propellant …
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 December 17, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2024.
- 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.