Expired Canadian patentCanada
Process for the preparation of penems
CA 1339845 C · Owner: Phillips, Douglas · Inventors: O'Neill, Brian Thomas; Phillips, Douglas
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An efficient, multistep process for the synthesis of certain 6-(1-hydroxyethyl) 2-substituted penem antibiotics from 2-4R-(triphenylmethylthio)-3S-(1R- (dimethyl-t-butylsilyloxy)ethyl)-2-azetidon-1-ylacetic acid esters.
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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 April 28, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 28, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 21, 1989
GrantedApril 28, 1998
Term endedApril 28, 2015
Patent numberCA 1339845 C
Classification (IPC)C07D499/89 +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.