Process for producing carboxetanocin g or a intermediate therefor
CA 2049047 A1 · Owner: Honjo, Mikio · Inventors: Sato, Yoshiko; Maruyama, Tokumi; Honjo, Mikio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for producing carboxethanocin G represented by formula (II): (II), or carboxethanocin A represented by formula 9: 9, both expected to be useful as antiviral agent and to, cyclobutane derivatives represented by formula 5: 5, wherein P is a protecting group for hydroxyl group which, are intermediates for said carboxethanocins G and A.
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 February 27, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2012.
- 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.