High temperature ptc device comprising a conductive polymer composition
CA 2216175 A1 · 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
The present invention provides a high, temperature PTC device comprising a conductive polymeric composition that exhibits a switching temperature that falls between 150°C and 190°C a PTC, effect of at least 10 3 and a low initial resistivity at 25°C of 10 .OMEGA.cm or less. The conductive polymeric composition comprises a semicrystalline polymer component selected from nylon-12 or nylon-11 and a, particulate conductive filler. The composition may include, in addition to the nylon-12 or nylon-11 a, second semicrystalline component that preferably is a polyolefin-based or polyester-based thermoplastic elastomer. Crosslinking of the composition enhances thermal and electrical stability.
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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 September 23, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2019.
- 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.