High pressure discharge lamp having overcurrent fuse protection
CA 2108997 C · Owner: Philips Electronics N.V. · Inventors: Ravi, Jagannathan; Luijks, Gerardus M.J.F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high pressure discharge lamp includes a resistive fuse (30) for overcurrent protection of its associated ballast which fuse is connected , electrically in series with the discharge vessel (1) of the lamp and continuously dissipates power, during lamp operation. The resistive fuse is heated by passage of the operating current, through the discharge vessel (1) during lamp operation to a temperature substantially, controlled by the operating current. In response to an increase in the operating current, to a predetermined overcurrent the resistive fuse reaches a temperature such that it, breaks and disconnects the discharge vessel from its source of electric potential within a, …
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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 October 22, 1993 and granted April 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 22, 2015.
- 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.