4-oxo-4h-pyrano-(3,2-c)-quinoline-2-carbonic acids and their salts
CA 1059511 A · Owner: Boehringer Ingelheim G.M.B.H. · Inventors: Hess, Friedrich K.; Stewart, Patrick B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to novel 4-oxo-4H pyrano-3,2-c-quinoline-2-carboxylic acids and the salts thereof as well as to processes for their production. The novel compounds possess antiallergic properties and are potentially useful in the treatment of allergic asthma, hay fever, nettle-rash eczema, atopic dermatitides and other allergic disease. Processes for the production of the novel compounds are described and examples of certain of the novel compounds are given. Pharmaceutical compositions containing the novel compounds are described and exemplified.
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
- Granted July 31, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 31, 1996.
- 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.