Process for preparing diketone compounds
CA 2242532 A1 · Owner: Cramp, Susan Mary · Inventors: Ellwood, Charles Walter; Cramp, Susan Mary; Pevere, Virginie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for preparing compounds of formula (I) wherein R2 is lower alkyl; or phenyl optionally substituted by from one to five groups which may be the same or different selected from lower alkyl lower haloalkyl, halogen and -SR4; R3 is halogen lower alkyl, lower , haloalkyl, lower alkoxy lower haloalkoxy, -S-alkyl, cycloalkyl having from 3 to 7 carbon atoms in the ring, alkenyl or alkynyl having from 3 to 7 carbon atoms, or -(CR5R6)q-SR2 wherein q is one or two; R4 is lower alkyl; R5 and R6 independently represent hydrogen, lower alkyl or lower haloalkyl; and n is zero or an integer from one to three; to intermediate compounds used in preparing compounds of …
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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 January 28, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 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.