Oxime ester photoinitiators having a combined structure
CA 2446722 A1 · Owner: Oka, Hidetaka · Inventors: Tanabe, Junichi; Kura, Hisatoshi; Kunimoto, Kazuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formulae I, II, and III wherein R1 is for example hydrogen C3-C8 cycloalkyl, C1-C12alkyl, phenyl unsubstituted or substituted; R2 and R2' for example are hydrogen, C1-C20alkyl, C3-C8cycloalkyl or phenyl unsubstituted or substituted, or are (I) (I) or (I); Ar1 is for example phenyl, optionally substituted by e.g. (CO)R7 (I)(D), (I)(E) and/or(I)(F); , Ar2 is for example phenylene optionally substituted e.g. by (CO)R7, (D) (E)or (F); Ar3 is for example phenyl; M1,M2 and M3 are for example, C1-, C20alkylene; M4 is for example direct bond -O-, -S-, -Y-(C1-C10alkylene)-Y'-, optionally substituted;Y and Y' are for example a direct bond or O; R7is for example hydrogen, …
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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 June 4, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 4, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 2024.
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Timeline
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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.