Alkene, alkyne or cycloalkylene derivatives
CA 1256875 A · Owner: Imperial Chemical Industries Plc · Inventors: Hughes, Leslie R.; Tucker, Howard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of the formula wherein X has the formula -CR5=CR6-, -C?C- or , wherein ring A is phenyl, naphthyl or heterocyclic;, wherein R1 is hydrogen, alkyl alkanoyl or aroyl;, wherein R2, R3 and R4 which may be the same or, different, each is an electron withdrawing substituent or each is hydrogen or alkyl, alkoxy or dialkylamino provided that when ring A is phenyl or naphthyl at least one of R2, R3 and R4 is an electron-withdrawing substituent;, wherein R5 and R6, each is hydrogen halogen, or alkyl;, wherein R7 is alkyl or halogenoalkyl; and wherein R8 has the formula -Y-Q-R9 wherein Y is straight- or branchedchain alkylene or alkenylene; wherein Q is -O- -S-, SO- or -SO2-;, and wherein …
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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
- Granted July 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 4, 2006.
- 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.