4-(hydroxydiphenylmethyl)-1-piperidylphenylalkane derivatives as antihistamines and a method of treatment of an allergic response
CA 2017573 C · Owner: Pein, Eckhardt · Inventors: Laven, Reinhard; Ritter, Helmut; Pein, Eckhardt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
4-(Hydroxydiphenylmethyl)-1-piperidylphenylalkane derivatives as antihistamines of the formula, and pharmaceutically acceptable salts of such derivatives are disclosed, in which, n is an integer between 0 and 2 R1 - R5 represent, independently of one another hydrogen and at least one of them represents a linear or branched alkyl radical with 1 - 4 carbon atoms, a C1-C3-alkoxy radical or a hydroxyl radical. A method of treatment of allergic response in mammals is also disclosed. -17-
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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 May 25, 1990 and granted May 21, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 25, 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.