Pumpable stemming
CA 2104545 A1 · Owner: Orica Canada Inc. · Inventors: Manz, Bradley Alan; Meiring, Jacob Lewis; Lubbe, Carl Hermanus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
Pumpable Stemming, This invention relates to the stemming of boreholes containing explosives. More particularly it relates to a method of stemming a borehole and to a stemming system, suitable for stemming a borehole containing a flowable explosive such as an emulsion explosive. According to the invention, there is provided a method of stemming a borehole having a mouth and a blind end and containing a charge of explosive loaded therein, which method comprises inserting a plug of stemming material from a bulk supply in a flowable state along a conduit into the borehole between a charge of, explosive loaded into the borehole and the mouth of the borehole and so that it forms, a plug which …
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 August 20, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 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.