Microcapsules containing inorganic colloids and method for making the same
CA 2080424 A1 · Owner: Moy, Jerry · Inventors: Moy, Jerry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Incorporation of inorganic colloidal particles into an encapsulation dispersion results in microcapsules having polymer shell walls further comprising colloidal inorganic particles. Capsules prepared in this manner have been found to be smaller in size, have a narrower size distribution and exhibit, decreased shell wall permeability. Capsules prepared using these colloidal particle dispersions are particularly useful in carbonless imaging constructions such as those containing a fill solution of a color precursor in a hydrophobic solvent and form deeply colored images when combined with a color developer.
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 October 13, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 13, 2014.
- 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.