Emulation circuit
CA 2618893 C · Owner: Vertix Led Limited · Inventors: Housman, David Vernon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An emulation circuit is disclosed for connection to a low energy lamp energised by an AC supply and substituted for an incandescent lamp in a traffic signal installation. The circuit comprises means (24) for sensing the magnitude of a supply voltage applied to energise the lamp connected to the terminals (12) and means for sensing correct operation of the lamp. When the lamp is sensed to be operating correctly an auxiliary load (R27 /R5) is , activated intermittently to draw an additional current through the auxiliary load from the AC supply. The additional current is drawn only between preset phase angles of the cycles of the AC supply and the magnitude of the additional current …
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 August 1, 2006 and granted April 23, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 1, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.