Chelating agents
CA 2095727 A1 · Owner: Crofts, Shaun P. · Inventors: Crofts, Shaun P.; Varadarajan, John; Carvalho, Joan F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to macrocyclic chelating agents optionally possessing more than one macrocyclic ring but typically characterised by their possession of at least two peptide linkages within the macrocyclic skeleton. These chelating agents may be used for example for the preparation of paramagnetic metal chelates for use as MRI contrast 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 November 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 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.
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.