Ballast for a lamp and method for operating a ballast for a lamp
CA 2415509 A1 · Owner: Sowa, Wolfram · Inventors: Heckmann, Markus; Busse, Olaf; Sowa, Wolfram
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a ballast for a lamp having an inverter which comprises at least one switch (S1; S2) and having a drive circuit (10) for alternately opening and closing the at least one switch (S1; S2) wherein the drive circuit (10) is designed to drive the at least one switch (S1; S2) alternately at at least two different frequencies (.omega.a, .omega.b). It also relates to a method for operating a ballast for a lamp having an inverter which comprises at least one switch (S1; S2) and having a drive circuit (10) for alternately opening and closing the at least one switch (S1; S2) wherein the drive circuit drives the at least one switch (S1; S2) alternately at at lease two different …
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
- Filed December 30, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 30, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2024.
- 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.