Pressure-or heat-sensitive recording material
CA 2004229 C · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Phaff, Rox; Zink, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pressure-sensitive or heat-sensitive recording material in which the colour reactant system contains, as main components, (A) a polycyclic compound of the formula (1) , in which, X is a monocyclic or polycyclic aromatic or heteroaromatic radical Y is a substituent detachable as an anion Q1 is-O-,-S-, or , Q2 is -CH2-, -CO-, -CS- or-S02- and R is hydrogen, C1-C12alkyl, C5-C10cycloalkyl aryl such as phenyl or aralkyl such as benzyl, and ring A is an aromatic or heterocyclic radical having 6 ring atoms which can, have an aromatic fused ring it being possible for both ring A and the fused ring to be substituted, (B) an organic condensation component capable of forming a chromogenic compound …
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 November 30, 1989 and granted February 6, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 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.