Bicyclopolyazamacrocyclocarboxylic acid complexes, their conjugates, processes for their preparation, and use as contrast agents
CA 2103554 C · Owner: The Dow Chemical Company · Inventors: Kiefer, Garry E.; Simon, Jaime
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Complexes of bicyclopolyazamacrocyclocarboxylic acid with Gd Mn or Fe ions , are disclosed. The complexes can be covalently attached to a biologically active molecule e.g. an antibody or , antibody fragment to form conjugates. The complexes and, conjugates are useful as contrast agents for diagnostic purposes. Processes for preparing both the complex and conjugate are disclosed.
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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 December 10, 1992 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 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.
Timeline
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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.