Electrodeless lamp bulb
CA 2111426 A1 · Owner: Keeffe, William M. · Inventors: Struck, Charles William; Keeffe, William M.; Shea, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved bulb for an electrodeless lamp has a transparent envelope with a continuous wall and contains a chemical fill comprising an inert starting gas mercury, alkali metal iodides, and a sufficient amount of scandium iodide and at least one iodide of a rare earth to increase the concentration of the rare earth in the vapor during lamp operation so as to enhance the color rendering index Ra, of, the lamp to a value greater than about 80 and result in a color temperature between about 3000 to about 5000 degrees Kelvin.
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 14, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 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.