Dual functioning excipient for metal chelate contrast agents
CA 2039399 C · Owner: E.R. Squibb & Sons, Inc. · Inventors: Tweedle, Michael F.; Chang, C. Allen; Kumar, Krishan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel dual functioning excipient for metal chelate contrast agents is disclosed. The present excipient, X mX'(L')n, which is the calcium or zinc salt of the calcium or zinc complex of an organic ligand, enhances safety in that it is able to scavenge both free metal ions and free organic ligand.
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 March 28, 1991 and granted September 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 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.