Radiopaque, optically transparent medical tubing
CA 2039658 A1 · Owner: Karakelle, Mutlu · Inventors: Lee, Min-Shiu; Karakelle, Mutlu; Spielvogel, David E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radiopaque optically transparent catheter has, a layer of a clear radiopaque polymer encapsulated by a layer of clear non-toxic biocompatible base polymer. Preferred clear radiopaque polymers are thermoplastic polyurethanes having iodine of bromine atoms covalently bound to the polymer chain. Preferred base polymers are thermoplastic polyurethanes. The encapsulated layer may be a stripe or an annular layer having base polymer layers laminated on both surfaces thereof.
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 April 3, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2013.
- 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.