Discrete polyurea microcapsules
CA 1094402 A · Owner: Stauffer Chemical Company · Inventors: Scher, Herbert B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Improved discrete polyurea microcapsules and their preparation effected by the addition of microcapsule polymer wall solvents or nonsolvents in the organic phase prior to microencapsulation, wherein said improvement is the result of the formation of distinct polymer walls by excluding water from the organic phase or by selectively controlling wall porosity or both effects.
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 January 27, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 27, 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.