Bi-level lighting control for hid lamps
CA 2115508 A1 · Owner: Koninklijke Philips Electronics N.V. · Inventors: Troy, Patrick E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Bi-level lighting control system for HID lamps. A bi-level control system includes a plurality of slave units each for, connection to a respective ballast and HID lamp of a plurality of HID lighting pictures and a common control unit. Each slave unit includes a switched capacitor and a slave relay which has one input connectable to a common line of an AC power supply branch circuit powering the fixtures and another input adapted for receiving a line voltage signal. The control unit includes an output connected to the control inputs of each of the slave units by a single control line and switchably connected to line voltage. Dimming of the HID lamp is accomplished by switching line voltage …
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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 February 11, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 11, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 2016.
- 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.