Cyclohexenol derivatives
CA 2050465 C · Owner: Shell Internationale Research Maatschappij B.V. · Inventors: Briner, Paul H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides cyclohexenol derivatives of the general formula, (see formula I) in which n represents an integer from 0 to 5: each R represents a halogen atom, nitro, cyano hydroxyl, alkyl, haloalkyl, alkoxy, haloalkoxy amino, alkylamino, dialkylamino, alkoxycarbonyl carboxyl, alkanoyl, alkylthio, alkylsulphinyl alkylsulphonyl, carbamoyl, alkylamido, cycloalkyl or phenyl group: and R1, R2 and R3 independently represent a hydrogen atom or an alkyl group, with the provisos that when R1 R2, and R3 all represent a hydrogen atom then n is not 0 and, when R1, R2 and R3 all represent a hydrogen atom and n is 1, R does not represent a fluorine atom substituted at the 4-position of the …
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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
- Filed August 30, 1991 and granted March 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 2013.
- 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.