Emulsion explosives containing a polymeric emulsifier
CA 2009955 C · Owner: Dyno Nobel Inc. · Inventors: Mckenzie, Lee F.; Lawrence, Lawrence D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A water-in-oil emulsion explosive or emulsion component of an explosive comprising an organic fuel as a continuous phase; an emulsified inorganic oxidizer salt solution or melt as a discontinuous phase; a density reducing agent and as an emulsifier, a bis-alkanolamine or bis-polyol derivative of a bis-carboxylated or anhydride derivatized olefinic or vinyl addition polymer in which the olefinic or vinyl addition polymer chain has an average chain length of from about 10 to about 32 carbon atoms, excluding side chains or branching.
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 13, 1990 and granted July 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 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.