Green-emitting phosphor and a low pressure mercury vapor lamp employing this phosphor
CA 1211781 A · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Umeda, Saburo; Ito, Hiroshi; Yamazaki, Hitoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a green-emitting phosphor and a low pressure mercury vapor discharge lamp using this phosphor. This phosphor has a monoclinic monazite-type crystal structure and comprises a phosphate of cerium terbium, and possibly lanthanum. It is significantly different from green-emitting phosphors of the prior art in that it further comprises at least one element selected from the alkali metals, fluorine, indium, and boron. Because of the addition of these elements, the decrease in powder brightness of the present phosphor after heating in air at 600 °C (the temperature at which phosphors are heated during the baking step of lamp manufacture) is much less than for conventional …
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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
- Granted September 23, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 2003.
- 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.