Electronic ballast for fluorescent lamps
CA 1317629 C · Owner: Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh · Inventors: Tausch, Wolfgang; Statnic, Eugen; Hirschmann, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Electronic ballast for fluorescent lamps having a rectifying circuit for the A.C. network voltage and a chopper circuit which chops the rectified voltage with a frequency considerably higher in comparison with the network voltage into a series of pulses which are then applied to one set of the ends of the two lamp electrodes via a current-restricting device, the other set of ends of which are connected to an ignition circuit, whereby a current-increasing circuit is inserted between the current-restricting circuit and the lamp electrodes which may comprise an LC-resonance circuit.
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 May 11, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 11, 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.