Heat-sensitive recording material
CA 2021416 C · Owner: Nippon Paper Industries Co. Ltd. · Inventors: Minami, Toshiaki; Fukuchi, Tadakazu; Kaneko, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat-sensitive recording material has a support and a color-developing layer which comprises as an organic color-developing agent 4-hydroxy-4'-n-propoxydiphenylsulfone and as a stabilizer a particular stabilizer. This heat-sensitive recording material is suitable for a high density-and speed-recording and is superior in the thermal preservalibity.
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 July 18, 1990 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 18, 2012.
- 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.