Bi-directional multi-frequency ripple control system
CA 1252533 A · Owner: Electricity Trust Of South Australia (The) · Inventors: Foord, Peter M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ripple control system for an electric power distribution system wherein the receiver has a pair of synchronous filters driven 90° out of phase with each other, the outputs of which are squared and summed to form an output independent of phase, and further discrimination means comprising a microcomputer programmed for frequency checking of each synchronous filter output whereby frequency differences between the synchronous filter centre frequency and the incoming signal frequency are used to give complete rejection characteristics, thus producing a very narrow bandpass filter for the receiver detection system and enabling the use of a large number of closely spaced frequencies for the …
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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 April 11, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 11, 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.