High temperature ptc device and conductive polymer composition
CA 2265199 C · Owner: Zhao, Liren · Inventors: Zhao, Liren
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high temperature PTC device comprising a polymeric conductive composition that includes nylon-11 and a carbon-based particulate conductive filler has, a switching temperature greater than 150°C preferably between about , 160°C and, 200°C. The composition demonstrates a high PTC effect (at least 10 3 and more, typically 10 4 to 10 5 or greater) and a resistivity at 25°C of 100 .OMEGA.cm or less, preferably, .OMEGA.cm or less. High temperature PTC devices that comprise nylon-11 or nylon-12, compositions and that are manufactured by extrusion/lamination demonstrate good, thermal and electrical stability compared with those manufactured by compression, molding and do not require …
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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 March 9, 1999 and granted March 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 9, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 2021.
- 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.