Thermal recording sheet
CA 2108612 C · Owner: Fukuchi, Tadakazu · Inventors: Minami, Toshiaki; Fukuchi, Tadakazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a thermal recording sheet including a substrate, an intermediate layer containing a pigment having a low oil absorption and a thermal color developing layer containing a leuco dye type chromogenic component containing a leuco dye and an organic color developer such as a 4hydroxy-4'-alkoxydiphenylsulfone and a metal chelate type chromogenic component containing a metal double salt of a C16-C35 fatty acid as an electron acceptor and a polyphenol compound having a C18-C35 long-chain alkyl group as an electron donor. The thermal recording sheet has improved dynamic sensitivity, image stability and printability.
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 October 18, 1993 and granted February 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2015.
- 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.