Expired Canadian patentCanada
N-hydroxyl protecting groups and process for the preparation of 3-acylamino-1-hydroxy-2-azetidinones
CA 1262357 C · Owner: Squibb (E.R.) & Sons, Inc. · Inventors: Mueller, Richard H.; Drossard, Jakob-Matthias; Ermann, Peter H.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Processes for preparing the useful, intermediates having the formula lower alkyl and, are disclosed herein, utilizing novel compounds having the formula, lower alkyl .
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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 October 17, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 17, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 17, 1985
GrantedOctober 17, 1989
Term endedOctober 17, 2006
Patent numberCA 1262357 C
Classification (IPC)C07D205/08 +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.