4,5,5a,6-tetrahydro-3h-isoxazolo¬5,4,3-kl acridines derivatives, a process for their preparation and their use as medicaments
CA 2018564 C · Owner: Hoechst Marion Roussel, Inc. · Inventors: Shutske, Gregory Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are disclosed compounds having the formula (see formula I), where, X as hydrogen, loweralkyl loweralkoxy, halogen or, trifluoromethyl and, R when present is hydrogen, loweralkyl allyl, arylloweralkyl, (see formula II) wherein R1 is loweralkyl, -CH2C=CH, (see formula III) (see formula IV), n being, 2, 3 or 4 and R2 and R3 being independently loweralkyl or, -2-, the group (see formula V) taken as a whole constituting (see formula VI), which, compounds are useful as analgesic agents and also for the treatment of various memory dysfunctions characterized by a decreased cholinergic function such as Alzheimer's disease.
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 June 8, 1990 and granted November 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 2012.
- 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.