Oxime ester photoinitiators
CA 2328376 A1 · Owner: Ohwa, Masaki · Inventors: Tanabe, Junichi; Ohwa, Masaki; Oka, Hidetaka
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, III, IV and V (see formulas I, II, III, IV and V) wherein R1 is is C4-C9cycloalkanoyl, C1-C12alkanoyl C4-C6alkenoyl, or benzoyl; R2 is , for example phenyl, C1-C20alkyl, C3-C8cycloalkyl, C2-C20alkanoyl or benzoyl; Ar1 is R4S-, phenyl or NR5R6phenyl, each of which optionally is substituted; or Ar1 is is (see formula VI) optionally, substituted; or Ar1 is naphthyl or anthracyl each of which is unsubstituted or substituted; or, Ar1 is benzoyl, naphthalenecarbonyl phenanthrenecarbonyl, anthracenecarbonyl or pyrene-, carbonyl, each of which is unsubstituted or substituted or Ar1 is 3,4,5-, trimethoxyphenyl, phenoxyphenyl or biphenyl; Ar2 is is (see formula …
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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 December 13, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 13, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2022.
- 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.