Expired Canadian patentCanada
Preparation of substituted isoserine esters using metal alkoxides and .beta.-lactams
CA 2098478 C · Owner: Holton, Robert A. · Inventors: Holton, Robert A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing N-acyl, N-sulfonyl and N-phosphoryl substituted isoserine esters in which a metal alkoxide is reacted with a .beta.-lactam.
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 22, 1992 and granted September 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 2014.
- 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 22, 1992
GrantedSeptember 14, 1999
Term endedSeptember 22, 2012
Patent numberCA 2098478 C
Classification (IPC)C07D305/14 +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.