Ammonium nitrate/fuel oil blasting explosive having decreased oil segregation
CA 2041916 C · Owner: Preston, Christopher J. · Inventors: Hajto, Ernest A.; Preston, Christopher J.; Reczkin, Earl D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
An explosive composition comprising an explosive mixture of ammonium nitrate, and fuel oil. The fuel oil is selected to provide an oil separation, sufficiently low so that the explosive is detonatable. The fuel oil is also, selected such that the viscosity of the explosive is sufficiently low so, that the explosive may be loadable into a borehole. The explosive is, substantially free of tackifying agents.
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 May 7, 1991 and granted April 12, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2013.
- 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.