Porous prilled ammonium nitrate
CA 2118074 C · Owner: Bals, Edwin · Inventors: Goosen, Adriaan J.; Bals, Edwin; Breedt, Jacobus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A porous grilled product, particularly ammonium nitrate and its method of preparation, which includes encapsulated microspheres particularly polymer microballoons, which serve to reduce the density of the product. The invention also extends to an explosives composition particularly ANFO and heavy ANFO including such ammonium nitrate of reduced density.
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 October 13, 1994 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 13, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 13, 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.