Modifier compounds
CA 2362458 A1 · Owner: Mathiaparanam, Ponnampalam · Inventors: Mathiaparanam, Ponnampalam
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 class of compounds useful in thermallyresponsive record material of the type comprising a substrate having provided thereon in substantially contiguous relationship an electron donating dye precursor, and an acidic developer material. The novel compound of the invention is a compound of the formula (I) wherein P is selected from (II) , and (III) wherein R~1? is selected from hydrogen alkoxy, and aralkoxy; , wherein R~2? is aralkoxyalkoxy when P is phenyl and R~2? is selected from , aralkoxyalkoxy or alkoxyalkoxy when P is naphthyl. Said alkyl moieties are each independently from one to eight carbons said aryl moieties each , independently being …
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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 4, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 4, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 2023.
- 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.