Ground fault circuit interrupter having loss of neutral or loss of ground protection
CA 2064080 C · Owner: Matsuoka, Joseph M. · Inventors: Matsuoka, Joseph M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ground fault circuit interrupter (1) is described which provides protection in the event of loss of neutral (3) or ground (4) excess potential between neutral and ground and reversed input connections. Separate independent tripping circuits are used for these latter faults and for ground faults thus eliminating problems due to interfering signals and reducing reliance on any one or group of components. An opto-emitter (25) and opto-detector (30) arrangement is used for detecting and causing tripping of a circuit breaker (6) in the event of faults other than ground faults.
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 May 17, 1990 and granted June 8, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 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.