Expired Canadian patentCanada
Removal of carboxy-protecting groups
CA 1069886 A · Owner: Shionogi And Co. · Inventors: Kataoka, Takahiro; Yoshioka, Mitsuru; Hirai, Shoichi
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mild deprotection of carboxy protecting groups which comprises treating an optionally substituted benzyl ester with a Lewis acid, preferably in the presence of a cation acceptor, if required followed by hydrolysis.
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 January 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedJanuary 15, 1980
Term endedJanuary 15, 1997
Patent numberCA 1069886 A
Classification (IPC)C07C57/00 +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.