Overvoltage protection for series capacitor equipment
CA 2070787 C · Owner: Asea Brown Boveri Ab · Inventors: Paulsson, Lars
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An overvoltage protective device for a series capacitor (C) has a main spark gap (I) and an auxiliary spark gap (2) arranged adjacent thereto, for ignition of the main spark gap. A second auxiliary spark gap (3) is arranged in association with the first auxiliary spark gap for ignition thereof. The auxiliary spark gaps are connected between one of the electrodes (11) of the main spark gap and a voltage divider which comprises resistors (R1 R2, R3) and a varistor (VR1). When the knee voltage of the varistor is exceeded, the second auxiliary spark gap (3) is ignited the arc of which initiates ignition of the first auxiliary spark gap (2), the arc of which in turn moves towards and ignites 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
- Filed November 26, 1990 and granted June 9, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 26, 2012.
- 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.