An electrical device compriseing a ptc polymer element for overcurrent fault and short-circuit current fault protection
CA 2331626 A1 · Owner: Abb Research Ltd. · Inventors: Strumpler, Ralf; Glatz-Reichenbach, Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an electrical device with a PTC polymer element having a, constriction. The constriction defines a web extending in a main current direction, over a length longer than in the prior art namely longer than 5 mm, preferably, longer than 15 mm. Further the aperture angle of the PTC polymer material at the, ends of the web is larger than 100°. A preferred choice of material is given, further. The invention achieves very high voltage-withstand capabilities.
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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 January 18, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 18, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 2023.
- 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.