Formulations for nanoparticulate x-ray blood pool contrast agents using high molecular weight nonionic surfactants
CA 2107165 A1 · Owner: Na, George C. · Inventors: Na, George C.; Rajagopalan, Natarajan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a composition comprised of nanoparticles containing an x-ray diagnostic compound, having a high molecular weight nonionic surfactant as a surface modifier adsorbed on the surface thereof and a cloud point modifier associated therewith. The present invention is also directed to a method for making nanoparticles comprising, (i) contacting said nanoparticle containing an x-ray diagnostic compound with a high molecular weight nonionic surfactant for a time and under conditions sufficient to form a nanoparticle with the surfactant adsorbed on the surface therof; and, (ii) contacting the so treated nanoparticle with a cloud point modifier for a time and under …
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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 28, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2015.
- 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.