Salt of 2,8-dicarboxy-4,6-dioxy-10-propyl-4h,6h- benzo(1,2-b:5,4-b')dipyran
CA 1112651 A · Owner: Fisons Limited · Inventors: Ingall, Anthony H.; Cairns, Hugh; Lee, Thomas B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is described a salt of 2,8-dicarboxy-4,6-dioxo-10propyl-4H,6H-benzo(1,2-b:5,4-b')dipyran with a pharmaceutically acceptable organic cation, the salt having a solubility of less than 3% w/w in water a 20.5°C. There are also described processes for making the salts and pharmaceutical, e.g. anti-allergic, compositions containing them.
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 November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 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.