Expired Canadian patentCanada
Substituted dihydrobenzopyrans
CA 1270834 C · Owner: Miyano, Masateru · Inventors: Miyano, Masateru; Sohn, Daniel Dungan; Shone, Robert Larry
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract The invention relates to compounds of the formula: which are useful as leukotriene D4 (LTD4) inhibitors and therefore useful in the treatment of allergies and inflammatory conditions.
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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
- Granted June 26, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 26, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 27, 1984
GrantedJune 26, 1990
Term endedJune 26, 2007
Patent numberCA 1270834 C
Classification (IPC)C07D311/04 +2 more
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.