Copolymers and their use as contrast agents in magnetic resonance imaging and in other applications
CA 2116357 A1 · Owner: Unger, Evan C. · Inventors: Wu, Guanli; Unger, Evan C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds used as contrast agents in MRI are described. The compounds comprise a copolymer comprising at least two of a first monomer of the formula:, X1-(CHR2CHR2-Y)n-(CHR2)m-CHR2CHR2-X2 wherein X and X2 are, independently, OH NH2, NHR1, COOH, COOR1, SH, or Z, Y is O NH, NR1, S, or CO, n is, 0-10,000, m is 0 or 1 each Z is C20 substituted alkyl or, cycloalkyl and each R2 is, independently, H or OH and at least one, of a second monomer which is a polynitrilo chelating agent having at least two COOH, COOR1, or COZ groups the first and second, monomers bound to one another from a copolymer through an ester amide, or carboxylic thioester linkage of at least one of OH NH2, NHR1, COOH, COOR1, …
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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 September 23, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 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
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.