3-(1h-tetrazol-5-yl) chromones
CA 1108151 A · Owner: Warner-Lambert Company · Inventors: Cohen, Marvin P.; Klutchko, Sylvester; Von Strandtmann, Max
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is described 3-(1H-tetrazol-5-yl)chromones having the following structural formula: I. in which R is lower alkoxy having 1 to 3 carbon atoms aryl, such as phenyl, halogen or trihalo lower alkyl. These compounds exhibit anti-allergic properties and are indicated in the treatment of allergic conditions such as hay fever and asthma.
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 September 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 1998.
- 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.