New leukotriene-b antagonists, methods of preparing them and their use as drugs
CA 2114951 A1 · Owner: Giesen, Claudia · Inventors: Ekerdt, Roland; Skuballa, Werner; Buchmann, Bernd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Describes are leukotriene-B4 antagonists of the formula (I), in which X is C1-C4 alkoxy or -S(O)p-(C1-C4)-alkyl p, being 0, 1 or 2; Y is a hydrogen atom or the group COACOR2 A, being an alkylene group with 1 to 6 C-atoms in the chain or one of the groups (a), (b) or (c), R1 and R2 are an OH -O-, (C1-C4)-alkyl, -O-(c3-C6)-cycloalkyl -O-(C7-C12)-aralkyl or, NR3R4 group, R3 and R4 being hydrogen C1-C4 alkyl, C3-C6, cycloalkyl, C6-C10 aryl or C7-C12 aralkyl plus their salts, with physiologically tolerable bases and their cyclodextrin clathrates. The invention also concerns methods for their manufacture, and their use as drugs.
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 August 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2014.
- 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.