Tuned filters for electric power systems
CA 2338907 A1 · Owner: Areva T & D Sa · Inventors: Ainsworth, John Desmond
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tuned filter for connection to a busbar in a high voltage electric power system. The filter incorporates a variable inductor (2); the variable inductor (2), comprising a main winding (4), auxiliary windings (6-12) and switching means (14-20) associated with each auxiliary winding (6). The auxiliary windings are arranged to act in inductive series with respect to the main winding and the, switching means (14) are used to selectively connect the auxiliary windings in electrical series with the main winding so allowing the inductance of the, inductor to be varied. To achieve enhanced variability of the inductance (2) each auxiliary winding (6-12) has a number of turns substantially equal to …
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 February 28, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 28, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 2023.
- 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.