Expired Canadian patentCanada
Intermediates to 1-carbacephalosporins and process for preparation thereof
CA 2050993 C · Owner: Tao, Eddie V. · Inventors: Aikins, James A.; Tao, Eddie V.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a process using hydrolysis and hydrogenation for converting enamino .beta.-lactams to their saturated alkyl ester acid salts, key intermediates to 1carbacephalosporins. Also disclosed are intermediates resulting from the process
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 September 9, 1991 and granted October 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 2013.
- 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 9, 1991
GrantedOctober 1, 2002
Term endedSeptember 9, 2011
Patent numberCA 2050993 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.