Photogeneration of amines from .alpha.-aminoacetophenones
CA 2224441 C · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Nakashima, Hiroko; Oka, Hidetaka; Kura, Hisatoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula I, II or III, , , wherein X is a divalent radical;, Y is C1-C6alkylene cyclohexylene or a direct bond;, Ar1 is an aromatic radical as defined in claim 1 R1 and R2 are each independently the other inter alia, a radical of formula , in which p is zero or 1 or, a radical of formula , R3 is, inter alia hydrogen, C1-C12alkyl, C5-C12cycloalkyl or phenyl-C1-C3alkyl;R4 is inter alia, C1-C12alkyl, C5-C12cycloalkyl phenyl-C1-C3alkyl or phenyl;, or an acid addition salt of a compound of formula 1 II or III;, are useful as photosensitive base catalysts in base crosslinking compositions.
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 10, 1997 and granted January 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 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.