Circuit arrangement
CA 2225320 A1 · Owner: Philips Electronics N.V. · Inventors: Lammers, Franciscus Hubertus Theodorus; Deurloo, Oscar Jan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a circuit arrangement for igniting and operating a high-pressure discharge lamp, provided with input terminals for connection of a supply source, output terminals for connection of the lamp switching means , for operating the lamp at a nominal lamp voltage Vla during stable lamp operation and for generating an open voltage Vo at the output terminals before the lamp has ignited, ignition means for generating an ignition voltage pulse when the voltage at the output terminals reaches a threshold value Vi a , control circuit for controlling the switching means. According to the invention, the circuit arrangement is characterized in that the control circuit …
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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 March 17, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2019.
- 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.