Use of an aqueous dispersion from a biodegradable polyester as a sheathing material for granulated fertilizer
CA 2267349 A1 · Owner: Yamamoto, Motonori · Inventors: Yamamoto, Motonori; Warzelhan, Volker; Nguyen Kim, Son
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a polyester dispersion containing water and a biodegradable copolyester encompassing structural units from (derivates from) a carboxylic acid, intended for use a sheathing material for granulated fertilizer. The invention also relates to the sheathed granulated fertilizer obtained from the polyester dispersion and the fertilizing method whereby said sheathed granulated fertilizer is applied.
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 September 29, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 2019.
- 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.