Radiopaque polyurethanes
CA 2098948 A1 · Owner: Bayer Corporation · 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
Mo3795, MD-90-31-PU, RADIOPAQUE POLYURETHANES ABSTRACT OF THE DISCLOSURE, This invention relates to radiopaque polyurethane compositions which are reaction products of (a) cycloaliphatic diisocyanates;, (b) at least one polyether diol having a molecular weight of from about 500 to about 6000; and, (c) an isocyanate-reactive bromine-containing compound selected from the group consisting of, (i) tetrabromodipentaerythritol and (ii) a mixture of tetrabromodipentaerythritol and dibromoneopentyl glycol; and, (d) optionally a catalyst;, wherein the amount of component (c) is such that bromine constitutes at least 15% by weight of the polyurethane composition, wherein the weight ratio of component …
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 June 22, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 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.