Recording paper and ink-jet recording process making use of the same
CA 2114067 C · Owner: Canon Kabushiki Kaisha · Inventors: Sakaki, Mamoru; Katayama, Masato
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is recording paper suitable for use in recording making use of a water-based recording liquid containing a dye which varies from water-soluble to water-insoluble according to the change of pH, wherein the recording paper is neutral or alkaline, and the surface pH of the paper is adjusted to a value not higher than the pH at which the dye turns water-insoluble.
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 January 24, 1994 and granted March 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 24, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 24, 2016.
- 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.