Control system for electrical lighting
CA 1321811 C · Owner: Lawrence, John Arthur · Inventors: Finch, David Alan; Lawrence, John Arthur
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control system for lighting a bank of fluorescent lamps, includes input terminals (10, 11) for mains voltage and output terminals (20, 21) to which the bank of lamps is connected. A transformer (T1) provides an reduced voltage (216v) as compared with the mains supply voltage (240v). The transformer (T2) provides a supplementary voltage (24v). Upon start up of the circuit, a control circuit (CC) operates contact (Al) to energise the transformer (T2) so that terminals (20 21) receive both the reduced voltage from (T1) and the supplementary voltage from (T2) (i.e. 240v) which is sufficient to strike the fluorescent lamps. The control circuit (CC), after a predetermined delay e.g. seconds …
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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
- Granted August 31, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 31, 2010.
- 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.