Canadian application, no grantCanada
Process for preparing chiral succinic acid derivatives
CA 2247580 A1 · Owner: F. Hoffmann-La Roche Ag · Inventors: Hilpert, Hans
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is concerned with a process for the manufacture of chiral succinic acid derivatives of formula (I) (see fig.I), wherein R1 is (C1-C6)alkyl or benzyl and the novel intermediates used, therein.
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 15, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 15, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 2020.
- 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 15, 1998
GrantedNo grant recorded
Term endedSeptember 15, 2018
Patent numberCA 2247580 A1
Classification (IPC)C07D233/74 +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.