Thermal recording material
CA 2371443 A1 · Owner: Matsumoto, Takashi · Inventors: Matsumoto, Takashi; Tsutsumi, Yasuhisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A thermal recording material which has excellent sensitivity in color development and gives an image having excellent storage stability. The recording material comprises a support and formed thereon a thermally colordeveloping layer comprising a leuco dye which is colorless or light-colored at ordinary temperature, at least one organic acid substance which upon heating reacts with the leuco dye to cause it to develop a color and a sensitizer. , The organic acid substance is at least one diphenyl sulfone derivative selected among 4-hydroxydiphenyl sulfone derivatives represented by general formula (1) or (2), 4,4'-dihydroxydiphenyl sulfone and 2,4'-dihydroxydiphenyl , sulfone, and the …
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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 April 27, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 27, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 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.