Ballast adaptor for improving operation of fluorescent lamps
CA 1256156 A · Owner: North American Philips Lighting Corporation · Inventors: Elms, Robert T.; Lagree, James L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
13, ABSTRACT:, Ballast adaptor for improving operation of fluorescent lamps. A ballast adaptor circuit which makes it possible to use a known rapid start ballast designed for, operating two T12 (38 mm diameter) fluorescent lamps for operation of two T8 (26 mm diameter) fluorescent lamps (14, 15) by means of a simple modification that does not require cutting wires or extensive rewiring of the ballast device. The adaptor circuit comprises an auxiliary circuit including a tuned series-parallel LC network (21, 24) connected in parallel with either one or both of the lamps. The LC network is tuned to supply an odd harmonic current to the lamps (14, 15) preferably, the seventh harmonic. Improved …
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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 June 20, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 20, 2006.
- 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.