Particulate urea with mineral filler incorporated for hardness
CA 2225155 C · Owner: Elrod, Jim L. · Inventors: Elrod, Jim L.; Aylen, Peter B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A particulate urea product having improved anticaking hardness and nonfriable , properties and which is useful for either direct application to the soil or as intermediate product for the subsequent incorporation with other fertilizer materials into solid bulk blends. The product consists of an admixture of urea and a finely divided mineral filler selected from the group consisting of diatomaceous earth, sodium bentonite, calcium bentonite kaolin, zeolite and , ball clay and is in either granular or prill form.
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 June 28, 1996 and granted September 24, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2018.
- 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.