Surge voltage absorbing apparatus
CA 2035526 A1 · Owner: Ito, Toshio · Inventors: Ito, Toshio; Ito, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A surge voltage absorbing apparatus has a transparent tube and a surge voltage absorbing element contained within the transparent tube to evolve heat upon discharge. The surge voltage absorbing element has a pair of lead wires, one of which extends directly out of the tube and fixed in place. A coil spring is disposed in the tube and has one end soldered to the corresponding lead wire of the surge voltage absorbing element and the other end portion extending out of the tube. A discharge occurs in the surge voltage absorbing element upon the flow of a surge current by lighting causing a solder spot to be broken to allow a terminal device to be open-circuited. It is thus possible to protect …
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 February 1, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 1, 2013.
- 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.