Thermally-responsive record material
CA 2295197 A1 · Owner: Debraal, John Charles · Inventors: Debraal, John Charles; Mathiaparanam, Ponnampalam; Fisher, Mark Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a novel thermally-responsive record material comprising a substrate having provided thereon in substantially contiguous relationship an electron donating dye precursor an acidic developer material, a, compound of the formula wherein R1, R2 and R3 are independently selected from hydrogen alkyl, alkoxy, aryl, aralkyl, aralkoxy halogen, alkoxyalkoxy, and aralkoxyalkoxy; wherein R4 is independently selected from alkoxyalkyl alkoxyalkoxy, and, aralkoxyalkoxy, and a suitable binder therefor. In the context of the present invention the alkyl moieties in the alkyl aralkyl, aralkoxy, alkoxyalkyl, alkoxyalkoxy and aralkoxyalkoxy preferably are eight carbons, or less, and …
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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 January 6, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 6, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 6, 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.