Electronic ballast
CA 2451440 C · Owner: Dejonge, Stuart · Inventors: Dejonge, Stuart; Travaglini, Dominick; Spira, Joel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electronic ballast for driving a gas discharge lamp includes a rectifier a , valley-fill circuit, an inverter having first and second series-connected controllably conductive device having complementary duty cycles a control , circuit for controlling the controllably conductive device and an independent , cat ear power supply to provide power to the ballast control circuits. The result is a ballast having substantially improved THD and current crest , factor. In a preferred embodiment the valley-fill circuit includes an energy storage device that stores energy in response to a controllably conductive device. In an especially preferred embodiment the controllably conductive , device …
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 June 24, 2002 and granted April 2, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2024.
- 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.