Thermochromic microencapsulated pigments
CA 2318700 A1 · Owner: Fujita, Katsuyuki · Inventors: Fujita, Katsuyuki; Senga, Kuniyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a thermochromic microencapsulated pigment which comprises as four essential components (a) an electron-donating chromatic organic compound (b) an, electron-accepting compound, (c) a reaction medium determining the temperatures at which the color reactions of component (a) with component (b) take place and (d) a, color change temperature regulator the color change, temperature regulator (d) comprising one or more compounds selected from the group consisting of esters alcohols, ketones, acid amides, hydrocarbons and fatty acids and, having a melting point Y (°C) satisfying the relationship (X+30)°C ~ Y ~ 200°C, wherein X (°C) is the melting point of, component (c), and the four …
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 September 13, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 13, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 13, 2022.
- 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.