Alkene, alkyne or cycloalkylene derivatives
CA 1269104 C · Owner: Imperial Chemical Industries Plc · Inventors: Tucker, Howard; Oldfield, John; Hughes, Leslie Richard
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 an optionally substituted, 5- or 6-membered 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 selected from halogeno, nitro, cyano, trifluoromethyl alkylthio, alkyl-, sulphinyl and alkylsulphonyl or each is hydrogen 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, which may be the same or different each is hydrogen, halogeno or alkyl; wherein R7 is …
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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 May 15, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 15, 2007.
- 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.