Leukotriene b4 derivatives, method for preparing them and their use as drugs
CA 2082818 A1 · Owner: Froehlich, Wolfgang · Inventors: Skuballa, Werner; Buchmann, Bernd; Giesen, Claudia
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Leukotriene-B4 derivatives of formula I (I), are described, in which, R1 means CH2OH CH3, CF3, COOR5, CONR6R7, or, R1 together with R2 means a carbonyl group R2 and R3 are the same or different and represent H or an organic acid radical with 1-15 C atoms R4 symbolizes H, C1-C10 alkyl optionally substituted once or several times by chlorine or bromine, C3-C10 cycloalkyl C6-C10, aryl radical optionally substituted independent from one, another, once or several times by chlorine bromine, phenyl, C1-, C4 alkyl, C1-C4 alkoxy fluoromethyl, chloromethyl, trifluoromethyl carboxy or hydroxy, or a 5-6-membered aromatic heterocyclic ring with at least 1 heteroatom R5 means hydrogen, C1-C10 alkyl, …
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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 February 24, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 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.