Ballast with adaptive end-of-lamp-life protection
CA 2429785 C · Owner: Prasad, Himamshu V. · Inventors: Prasad, Himamshu V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ballast having an inverter and a direct current blocking capacitor coupled in series , with a ballast output includes a control circuit for providing adaptive end-oflamp-life , protection. During operation control circuit executes the steps of measuring and storing a , reference value for the voltage across the DC blocking capacitor monitoring , the voltage , across the DC blocking capacitor and protecting the inverter and lamp sockets in response to , the voltage across the DC blocking capacitor departing from the reference value by more than , a predetermined threshold amount.
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 May 23, 2003 and granted September 27, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2025.
- 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.