Current limiter and/or circuit breaker with ptc element
CA 2233351 A1 · Owner: Ngk Insulators, Ltd. · Inventors: Yokoi, Seigo; Mizuno, Yukio; Ohashi, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A current limiter composed of a PCT element the resistance of which is abruptly increased by rise of temperature above a resistance transition temperature and a pair of electrode plates secured to opposite surfaces of the PTC element, wherein the PTC element is formed thinner at its outer peripheral portion than at its central portion so that the specific resistance of the central portion becomes smaller than that of the outer peripheral portion.
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 March 26, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2020.
- 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.