Series gapped metal oxide surge arrester
CA 2027288 A1 · Owner: Wendahl, Laurence K. · Inventors: Wendahl, Laurence K.; Kershaw, Stanley S. Jr.; Hartman, Thomas C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A surge arrester is provided including highly non-linear metal oxide varistor disks in series with one or more resistively graded gap assemblies. The gap assemblies comprise a low exponent, non-linear silicon carbide resistive material in parallel with a spark gap. In this combination the, arrester voltage is shared between the gap assemblies and the MOV disks at normal steady-state system voltages. The arrester provides substantial improvements in temporary overvoltage performance and protection levels over conventional gapless MOV arrester designs.
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 October 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2012.
- 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.