Aminomethylene derivatives and ultraviolet absorber comprising the same
CA 2267108 A1 · Owner: Yasuda, Heinosuke · Inventors: Hukuoka, Naohiko; Yasuda, Heinosuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aminomethylene derivative represented by general formula (I) wherein A represents a cyclic oxo group selected from the group consisting of general formulae (a), (b), (c), (d), and (e), R1 R2, R3, R4, and R5 each , independently represent H an alkyl group or the like; R6, R7, and R8 each independently represent an alkyl group or the like; R1 and R2 may combine with each other to form a tetramethylene group or the like; R7 and R8 may combine with each other to form a tetramethylene group or the like; R represents an alkyl group optionally containing OH or O; and n is an integer of 0 to 4 a , process for preparing the same, and the use thereof. The derivatives have an excellent …
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 October 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 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.