Electronic fault detector for variable frequency ac systems and circuit breaker incorporating same
CA 2426436 A1 · Owner: Parker, Kevin Lynn · Inventors: Parker, Kevin Lynn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fault detector processes half cycles of current in variable frequency ac power systems by weighting half cycle magnitude values by the period of the half, cycle. Time attenuated accumulations of the weighted half cycle peak values exceeding a first threshold for short delay protection and of weighted , positive, differences between the peak values of successive half cycles and the preceding half, cycles for a selected period of time after a peak value exceeds a second threshold for, arc faults, generate trip signals when they reach specified levels.
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 April 23, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 23, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2025.
- 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.