Electronic ballast
CA 2059016 A1 · Owner: Ultra Canada Ltd. · Inventors: So, Gin P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A circuit is disclosed to implement an energy saving electronic ballast for driving a fluorescent lamp or tube. The circuit is characterized by a high power factor low, harmonic distortion and minimized radio frequency interference. The circuit includes a unique DC power supply comprising a high pass filter, which receives an AC input signal a diode, bridge rectifier and a high speed diode rectifier which cooperates with the bridge rectifier to provide the power supply with first and second rectification stages. A current regulating capacitor for driving the fluorescent lamp or tube is connected to the DC power supply between the first and second rectification stages. A trigger and high …
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 January 8, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 8, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 2014.
- 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.