1,4-diazepine derivative and its pharmaceutical use
CA 2000985 C · Owner: Miyamoto, Mitsuaki · Inventors: Miyazawa, Shuhei; Katayama, Satoshi; Miyamoto, Mitsuaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Triazolo-1,4-di-azepine compounds of the formula: (see formula I), and pharmacologically acceptable salts thereof wherein R1, and R2 are hydrogen or alkyl R3 is hydrogen or halogen, R4, is hydrogen or alkyl X is -OCO-, -NHCO-, -CO- or others and Y is cycloalkyl, cycloalkylalkyl, alkynyl or others are, useful in the pharmaceutical field especially pertaining to, allergic diseases.
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 October 18, 1989 and granted January 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2011.
- 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.