Thermal recording sheet
CA 2104906 C · Owner: Nippon Paper Industries Co. Ltd. · 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
A thermal recording sheet is provided that is superior in dynamic sensitivity dot reproducibility, image quality and image storage stability and is resistant to yellowing of the sheet caused by NOx gas. The thermal recording sheet comprises an intermediate layer and a thermal color developing layer provided in turn on a substrate wherein the intermediate layer contains a pigment having an oil absorption (according to JIS K5101) of less than 80 ml/100g and a compound of the following general formula (I): (see formula I) (wherein R denotes propyl isopropyl, or n-butyl), and carbonate are contained in the thermal color developing layer.
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 August 26, 1993 and granted January 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 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.