Substituted triazolopyridazines
CA 2035499 C · Owner: Marion Merrell Dow Canada Inc. · Inventors: Peet, Norton P.; Sunder, Shyam
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a group of compounds which are acyl derivatives of amino substituted triazolopyridazines. They are prepared by the reaction of an aminotriazolopyridazine or an aminotriazolophthalazine with an appropriate acid chloride. These compounds possess bronchodilating and anti-allergenic activity and are of the following general formula:, wherein, R7 and R8 are each independently H or CH3 or R7 and R8 together, are -CH2CH2CH2CH2-; and when R7 and R8 are together -CH2CH2CH2CH2-, then, R3 is , or -NH2 ; and when R7 and R8 are each independently H or CH3 then, R3 is , or , -2-
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 February 1, 1991 and granted October 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 1, 2013.
- 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.