Transformer fault protection device
CA 2057482 C · Owner: Efantis, Antonios · Inventors: Efantis, Antonios
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transformer ground fault protector is provided and includes sensing means to be positioned adjacent but spaced from the output of each secondary winding in a transformer having its secondary windings connected in series and at the, midpoint of the series circuit to ground. The sensing means forms a capacitive circuit, with the windings and generates an output voltage when the secondary windings are, energized. The output voltages generated by the sensing means are combined which, in normal operation of the transformer results in a voltage having a , magnitude substantially equal to zero volts. However when a fault occurs in the , transformer the output voltages induced in the sensing …
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 December 12, 1991 and granted October 31, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 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.