Method of encapsulating hydrophobic organic molecules in polyurea capsules
CA 2487352 C · Owner: Shulkin, Anna · Inventors: Shulkin, Anna; Stoever, Harald D.H.; Croll, Lisa M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is known to encapsulate various materials in polyurea microcapsules but , obtaining satisfactory microcapsules incorporating alcoholic materials has proven difficult. A process has now been found where polyurea microcapsules are formed by interfacial polymerization between an aqueous phase and a waterimmiscible phase, and properties, particularly the solubility parameters of , the water~ immiscible phase are closely matched to corresponding properties of the polyurea. Microcapsules prepared by this process have improved stability mechanical strength and controlled release properties.
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 2, 2003 and granted June 19, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 2, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2025.
- 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.