New .alpha.-aminoacetophenone photoinitiators
CA 2223376 A1 · Owner: Oka, Hidetaka · Inventors: Ohwa, Masaki; Matsumoto,Akira; Birbaum, Jean-Luc
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 and IV (see fig. I) (see fig. II), (see fig. III) (see fig. IV) wherein Ar for example is a phenyl, biphenyl or benzoylphenyl group which is unsubstituted, or substituted; Ar1 for example, has the same meanings as Ar; Ar2 is inter alia phenyl; X may be a direct bond; Y hydrogen, etc.; R1 and R2 for example C1-C8alkyl; R3 inter alia hydrogen or C1-C12alkyl; R4 is inter alia C1-C12alkyl; or R3 and R4 together are C3-C7alkylene; R5 is for example C1-C6alkylene; and Z is a divalent radical; provided that at least one of the radicals Ar, Ar1, Ar2 Ar3, R1, R2, R3, R4, R5 or Y is substituted by 1 to 5 SH groups, or provided that Y contains at least one -SS- …
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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 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2019.
- 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.