Granular fertilizer composition having controlled release and process for the preparation thereof
CA 1256710 A · Owner: Sierra Chemical Company · Inventors: Lambie, Johannes M.H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Fertilizer composition in granular form having a regulated release of water-soluble fertilizer agents such as nitrogen, phosphorous, and potassium compounds. Each granule has a core comprising fertilizer substances having a known pH value, and a coating encapsulating the core. The coating is based on dicyclopentadiene and either linseed oil or a soy bean oil alkyd. The coating serves as a pH-regulator, so that for a core having a pH value below 6.0, the pH of the coating is regulated to be in the range of 6.0 to 9.0, while for a core having a pH value higher than 6.0 the coating includes a mixture of trace element compounds and has a pH value lying between 4.5 …
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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
- Granted July 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 4, 2006.
- 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.