Driver circuit for led vehicle lamp
CA 2775736 C · Owner: Osram Sylvania Inc. · Inventors: Madhani, Vipin; Johnsen, Andrew O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An LED driver includes a first LED string having an anode of a first LED connected to an input voltage and a cathode of a last LED connected to a first current sensing resistor and a second LED string having an anode of a first LED connected to the input voltage and a cathode of a last LED connected to a second current sensing resistor. A control switch is connected to the first and second current sensing resistors for providing regulation of current passing through the first and second LED strings in response to a stop signal and a tail signal provided to the LED driver. A feedback circuit is connected to the control switch for controlling the control switch and the current passing through …
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 26, 2004 and granted September 30, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 26, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2026.
- 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.