Fluorescent lights
CA 1308772 C · Owner: Lui, Chi Man · Inventors: Yuen, To; Chan, Bong; Poon, Chiu Yeung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fluorescent lamp system in which an inductor (12) is connected in series with the cathodes (4 6) of a, gas discharge tube (2). Separate connections (14 16) are, tapped from the inductor (12) and also coupled to the cathodes of the tube. One connection includes a capacitor (18). Upon connection of an AC electrical supply a voltage builds up and discharges from the capacitor (18) at one cathode (4) as a surge voltage builds up at the other cathode (6). The resulting peak voltage at the cathodes is sufficient to immediately strike an arc in the tube (2).
Read the whole patent
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 October 13, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 2009.
- 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.