Additional further novel aklanophenones
CA 2025471 A1 · Owner: Schaub, Bruno · Inventors: Von Sprecher, Andreas; Schaub, Bruno; Lang, Robert W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
CA - 4-17748/+, Additional further novel alkanophenones Abstract, p-Substituted alkanophenones of the general formula (I), wherein R1 is unsubstituted or fluorinated lower alkyl R2 is hydrogen, unsubstituted or, fluorinated lower alkyl or lower alkenyl X is lower alkylene, oxy, thio or a direct bond alk is lower alkylene, n is 1 or 2, R3 is unsubstituted or chlorinated polyfluoro-lower alkyl R4 is free, esterified or amidated carboxy or 5-tetrazolyl and R5 is hydrogen or lower, alkyl, have leucotriene-antagonistic properties and can be used as anti-allergic medicinal active ingredients. The process for their preparation comprises reacting an epoxide of formula, (II), wherein R1, R2, X, alk, …
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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 September 17, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 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.