Method for loading slurry explosives in blast holes or cartridges
CA 2302737 C · Owner: Dyno Nobel Inc · Inventors: Vestre, Jan Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A method for loading and sensitising a slurry explosive in a borehole or in a cartridge, where a gassing agent is added as a thin string inside the slurry explosive after the explosive has been pumped into a loading pipe and wherein , the slurry explosive and a gassing agent are mixed at the end of the loading pipe and sensitised in the borehole or the cartridge. Optionally the loading pipe is lubricated with water or a water solution to reduce the pump pressure.
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 11, 1998 and granted December 2, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 11, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 11, 2020.
- 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.