Color-developing sheet for pressure-sensitive recording sheets
CA 1285764 C · Owner: Jujo Paper Co. Ltd. · Inventors: Hasegawa, Akira; Suzuki, Mamoru; Umeda, Hiroaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A color-developing sheet for pressure-sensitive recording system is disclosed. The color-developing sheet comprises a color-developing agent containing a phenol polymer in combination with a polyvalent metal salt of a carboxylated terpenephenol resin and/or a reaction product of a carboxylated terpenephenol resin an aromatic carboxylic acid and a polyvalent metal compound. The color-developing sheet has superior plasticizer resistance and little deterioration of color-developing ability with the lapse of time.
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
- Granted July 9, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 2008.
- 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.