Explosive comprising a mixture of a nitrate-oil explosive and a water-in-oil emulsion explosive, and a method for its manufacture
CA 2013307 C · Owner: Norsk Hydro A.S. · Inventors: Nygaard, Erik Christopher; Carlsen, Arne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
The present invention relates to a HANFO explosive consisting of a mixture of at least one nitrate-oil explosive (ANFO-type) and at least one water-in-oil explosive and a method for its, manufacture. The oil of the ANFO part contains 0.3 - 7.0 weight% based on the weight of the oil component of the oilsoluble elastomer having a viscosity average molecular weight of 30.000 - 5 mill. preferably 900.000 - 2.5 mill. The manufacture of the HANFO explosive can be carried out by first adding an oilsoluble elastomer to the oil of the ANFO-type explosive, then mixing the oil with sodiumammonium- and/or, calcium nitrate and then mixing this mixture together with a water-in-oil emulsion explosive. The …
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 March 29, 1990 and granted December 7, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 29, 2012.
- 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.