Gas tube surge protector with interacting varistors
CA 2239258 C · Owner: Napiorkowski, John J. · Inventors: Brower, Boyd G.; Napiorkowski, John J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A surge protector is provided that has a gas tube and at least one MOV that is coordinated with the gas tube such that the MOV interacts with the gas tube lower the impulse breakdown voltage of a gas tube of a type that has a wide range of DC breakdown voltages across a population of the gas tubes. The gas tube is a generally cylindrical three element gas tube and the MOVs are disposed at opposite ends of the gas with fusible elements maintained in position by a clip. A population of the gas tubes has a range of breakdown voltages and the clamping voltage of the MOVs is set within this range such that the MOV will interact with any gas tube with a breakdown voltage in the population range …
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 June 1, 1998 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 1, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 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.