Ammoniation of ground leonardite ore for dust suppression
CA 2090273 A1 · Owner: Keen, David · Inventors: Keen, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of manufacturing relatively dustfree, water-soluble ammonium humate particles for agricultural, plant growth and drilling fluid viscosity lowering uses and to a method of improving the yield of agricultural and horticultural crops by ammoniating a ground leonardite ore. Ground and at least partially dried leonardite ore is contacted, during or after grinding, with an aqueous solution of ammonia to substantially suppress dust formation resulting from the grinding operation and to render the leonardite ore particles substantially more absorbent to aqueous nutrients and more easily dispersed into soil for agricultural purposes. The ammoniated leonardite ore particles also are more …
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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, and the Claude kit works from them.
Why it's free to use
- Filed February 24, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2015.
- 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.