New spirocyclic compounds
CA 2249663 C · Owner: Bajgrowicz, Jerzy A. · Inventors: Bourdin, Bernadette; Bajgrowicz, Jerzy A.; Frater, Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The new spirocyclic compounds of the general formula (I): are powerful odorants. In the formula the -C(O)X-substituted ring is saturated or unsaturated in the .alpha. or .beta. position and X represents a, methylene group or an oxygen atom R1, R2, R3, R4 are, independently a hydrogen atom or a methyl radical n or n', are independently 1 or 2 and R4 can be at any position on the ring not being the -C(O)X substituted ring.
Read the whole patent
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 October 7, 1998 and granted July 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 7, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 2020.
- 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.