Urea granulation
CA 1101641 A · Owner: Compagnie Neerlandaise De L'Azote (Societe Anonyme) · Inventors: Geothals, Rafael A.J.; Niks, Anton; Van Hijfte, Willy H.P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title:, Improvements in or relating to urea granulation. Abstract of the disclosure: Urea granules are prepared by spraying an aqueous urea solution having a urea concentration of 70-99.9% by weight on to fluidized urea nuclei in the form of droplets having a mean drop diameter of 20-120 µm at a temperature at which the water is evaporated from the solution sprayed on to the nuclei and urea crystallizes on the nuclei to-form granules having a desired size.
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
- Granted May 26, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 1998.
- 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.