Ballast circuit
CA 2335856 A1 · Owner: Moisin, Mihail S. · Inventors: Moisin, Mihail S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A circuit including a rectifier having rectifying diodes has a feedback signal which provides substantially linear operation of the rectifying diodes. In one embodiment, a ballast circuit includes a rectifier circuit coupled to an inverter circuit which energizes a fluorescent lamp. The inverter circuit includes a ballast capacitor coupled to an inductive feedback element. The voltages generated accross the ballast capacitors and the feedback element combine to provide a feedback signal that is effective to periodically bias at least one of the rectifying diodes to a conductive state during substantially the entire AC input signal. The substantially linear operation of 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 June 21, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 21, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 2021.
- 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.