Canadian application, no grantCanada
Intermediates for chelating agents with prefixed symmetry and process for their preparation
CA 2090433 A1 · Owner: Dibra S.P.A. · Inventors: Virtuani, Mario; Anelli, Pier Lucio; Uggeri, Fulvio
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 preparation of compounds of formula (I) wherein R and R1, have the meanings specified in claim 1 is disclosed; compounds, (I) are useful intermediates for the preparation of chelating agents.
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 August 14, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 14, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 14, 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.
FiledAugust 14, 1991
GrantedNo grant recorded
Term endedAugust 14, 2011
Patent numberCA 2090433 A1
Classification (IPC)C07D257/02 +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.