Heat-sensitive recording material
CA 2023670 C · Owner: Yoshizawa, Katsuaki · Inventors: Yoshizawa, Katsuaki; Takayama, Yukio; Ishida, Koichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a heat-sensitive recording material comprising:, (a) a base sheet;, (b) a heat-sensitive recording layer formed on the base sheet and comprising a colorless or pale-colored basic dye and a color developing material which develops a color on contact with the dye; and, (c) a protective layer formed on the recording layer and comprising a binder and at least one metal salt selected from the group consisting. of.magnesium acetate calcium.acetate,..aluminum acetate, magnesium formate calcium formate and aluminum formate.
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 21, 1990 and granted March 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 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.