Tubing and method for making same
CA 2188013 C · Owner: Wang, James · Inventors: Wang, James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Differential stiffness tubing for medical products such, as catheters, and a method and apparatus for making the tubing. The tubing has a stiff section and a flexible section joined by a relatively short transition section which the materials of the stiff and flexible sections are wedged into each other in a smooth gradual manner to produce an inseparable bond between the materials without abrupt joints. The tubing is made using a resin modulating system and a unique co-extrusion head that minimize the length of the transition section by minimizing the volumes in all flow channels of the head.
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, 1995 and granted December 18, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2017.
- 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.