Radiopaque polyurethanes
CA 2111155 A1 · Owner: Sarpeshkar, Ashok M. · Inventors: Markusch, Peter H.; Sarpeshkar, Ashok M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to radiopaque polyurethane compositions that are reaction products of (a) cycloaliphatic diisocyanates;, (b) at least one polyester polycarbonate, and/or polyester, carbonate diol having a molecular weight of from about 1000 to about 6000;, (c) an isocyanate-reactive bromine-containing aromatic chain extender; and, (d) optionally, a catalyst; wherein the quantity of component (c) is such that the amount of bromine in the polyurethane composition is from 10 to 35% by weight, and wherein the components are reacted at an isocyanate index of from 0.95 to 1.2.
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 December 10, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 10, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 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.