Tool for manually tripping a fault indicator for high voltage electric power circuits and resetting same
CA 1084589 A · Owner: Schweitzer, Edmund O. Jr. · Inventors: Schweitzer, Edmund O. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to tools for testing fault indicators of the kind and character disclosed in my U.S. Patent No. 3,906,477, issued September 16 1975. The fault indicator includes a magnetically operable reed switch to be positioned in the magnetic field generated around a conductor carrying alternating fault current and a resetting circuit to reset an indicator. The tool has a unitary structure which includes a winding to be positioned generally parallel to the reed switch to close the switch when energized and an oscillator to operate the resetting circuit.
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
- Granted August 26, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 26, 1997.
- 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.