Electronic lamp ballast
CA 2104619 A1 · Owner: Tary, Tamas · Inventors: Tary, Tamas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electronic ballast for discharge lamps comprises an open loop configuration of an impedance converter first stage and an inverter second stage linked by a limiting control stage. The impedance converter stage presents its load, passive or active as input, resistance. It draws a continuous current through large, RFI/EMI suppressing input inductors which is switched, discontinuously through a tank circuit using an energy transfer relationship based on the switch on-time and the inductance and capacitance of the tank circuit. The impedance converter stage supplies unregulated power to the inverter stage which operates stably at a fixed frequency. If an imbalance such as an overcurrent …
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 August 23, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 2015.
- 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.