Ground-fault circuit interrupter
CA 1262771 C · Owner: Nichols, E. Lane, Iii · Inventors: Hooper, William P.; Nichols, E. Lane, Iii; Leynse, Kenneth J.
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 is provided with an additional current-sensing element that responds to a net value of current through the power wires in an ac circuit. The winding may be wound on a ferromagnetic core of its own or it may be placed as a separate winding on a core that is used to sense imbalance in a GFCI. In the latter case the extra winding must be insulated electrically from the main sense winding. The additional coil is connected to a rectifying diode and a capacitor, so that an imbalance of current in the power wires charges the capacitor. The voltage thus developed across the capacitor is used to operate the tripping mechanism of the ground-fault circuit …
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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
- Granted November 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 7, 2006.
- 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.