Metal halide discharge lamp with defined shank loading factor
CA 2076638 C · Owner: Avdenko, Michael · Inventors: Avdenko, Michael; Briggs, Daniel C.; Thomas, Brian J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A low-wattage metal-halide discharge lamp (10) has a quartz tube (12) of the double-ended type that forms a bulb (14) or envelope a pair of electrodes, e.g. an, anode (30) and a cathode (32) which penetrate into an arc chamber (16) inside the, envelope (14), and a suitable amount of mercury plus one or more metal halide salts. The electrodes (30, 31) are each formed of a refractory metal i.e. tungsten, wire, extending through the respective necks (22 24) into the arc chamber , (16). Heat dissipation through the neck (22 24) is controlled by constructing the quartz, shanks (26, 28) so that they have shank segments of a desired surface area that ex-, tend from the necks (22, 24) a distance …
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, 1991 and granted August 13, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2013.
- 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.