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Expired Canadian patentCanada

N-phenylpyrazol-4-yl ether derivatives

CA 1332608 C · Owner: Hawkins, David William · Inventors: Hawkins, David William; Hatton, Leslie Roy; Pennicard, Richard Glyn

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Abstract From the Canadian patent

An N-phenylpyrazol-4-yl ether derivative of the formula:, I , wherein R1 represents halogen alkyl or alkoxy unsubstituted, or substituted by halogen alkylthio or alkylsulphinyl, substituted by one or more halogen atoms nitro, cyano, or, alkylsulphonyl unsubstituted or substituted by halogen and n is 1 to 5, R3 represents hydrogen, halogen cyano, nitro or, alkyl group R which may be unsubstituted or substituted by halogen, R4 represents alkyl, alkenyl or alkynyl which is substituted by halogen, R5 represents hydrogen or an amino group NR6R7 wherein R6 and R7 represent hydrogen alkyl, formyl or alkanoyl (or R6 and R7 together form a 5 or 6 membered cyclic imide) which may be unsubstituted or …

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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 October 18, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 18, 2011.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 5, 1989
GrantedOctober 18, 1994
Term endedOctober 18, 2011
Patent numberCA 1332608 C
Classification (IPC)C07D231/14 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedJuly 5, 1989Patent grantedOct 18, 1994Term endedOct 18, 2011

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.