Method and apparatus for charging bore-holes with explosive
CA 2116463 C · Owner: Dyno Nobel Sweden Ab · Inventors: Magnusson, Rolf; Engsbraten, Bjorn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
19 A method for charging explosives in substantially horizontal bore holes with a loading density reduced in relation to that corresponding to the complete fill up of the bore-hole diameter with the explosive in bulk form comprising that a charging hose with an end opening is introduced into at least one bore-hole of a blasting round that a pumpable and coherent bulk explosive is pumped through the charging hose at a controlled rate that simultaneous with the pumping of explosive the hose is withdrawn at a controlled rate that the pumping and withdrawal rates are adjusted to form a coherent string exiting from the hose end opening said exiting string only partially filling up the bore-hole …
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 25, 1994 and granted July 27, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2016.
- 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.