Near infrared absorbent and display/recording materials prepared by using same
CA 2005520 A1 · Owner: Nishizawa, Tutomu · Inventors: Enomoto, Katashi; Oguchi, Takahisa; Nishizawa, Tutomu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Near infrared absorbers which have a molecular extinction coefficient of 200,000 or more and are represented by the formula (I), (I), wherein each of Y1 Y2, Y3, Y4, Y5, Y6 , Y7 and Y8 is, hydrogen an alkyl group, alkoxyl group or alkylthio group each of A1, A2, A3, A4, A5, A6, A7 and A8 is hydrogen, halogen, a nitro group, alkyl group aralkyl, group, alkenyl group, alkynyl group alkoxyl group, aryloxy group, alkylthio group or arylthio group; and Met represents two hydrogen atoms or a metal are, useful for the production of optical display and recording materials. 65/jmw
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 December 14, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 14, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 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.