Granular coated fertilizer
CA 2396834 C · Owner: Sumitomo Chemical Company, Limited · Inventors: Tabei, Nobuaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a granular fertilizer which is coated with a thermosetting resin layer (first thermosetting resin layer) a water-insoluble material layer and a thermosetting resin layer (second thermosetting resin layer) from inner to outer layers and it can release fertilizer ingredients for a long time by a smaller amount of coating materials than known coated fertilizers.
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, and the Claude kit works from them.
Why it's free to use
- Filed August 6, 2002 and granted January 18, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 6, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2024.
- 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.