Method of balloon formation by cold drawing/necking
CA 2236879 C · Owner: Chen, Jianhua · Inventors: Wang, Lixiao; Lee, Nao; Horn, Daniel J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for forming a balloon for a dilatation catheter involving the steps of extruding a segment of thermoplastic material maintaining the center , portion at a temperature below the glass transition of the thermoplastic material, drawing the segment to a predetermined length wherein after the , drawing the wall thickness of the center portion does not appreciably change and expanding the segment in a mold to produce the balloon.
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 October 4, 1996 and granted September 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 4, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 2018.
- 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.