Pressure-sensitive recording paper and color developer therefor
CA 1329985 C · Owner: Sato, Teiji · Inventors: Saito, Mitsuo; Ogawa, Masahide; Abe, Kiyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a color developer for a pressure sensitive recording paper, which comprises an acidtreated smectite clay mineral having a specific chemical composition, an X-ray diffraction pattern peculiar to dioctahedral smectite, a specific solid NMR spectrum and a specific cation exchange capacity. This color developer shows a high whiteness, a high initial color density, excellent light resistance and weatherability and a low viscosity.
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 June 7, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 7, 2011.
- 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.