Electroluminescent phosphor with extended life and method of making same
CA 2277344 A1 · Owner: Osram Sylvania Inc. · Inventors: Vanderpool, Clarence D.; Gingerich, Richard G.W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electroluminescent phosphor containing an effective amount of bismuth to increase, the half life of the phosphor compared to the half life of the phosphor without the, bismuth. The phosphor is produced by the method comprising the steps of preparing the, electroluminescent phosphor; adding granular elemental bismuth to the bottom , of a quartz reaction vessel; covering the bismuth with a layer of quartz wool; placing the, phosphor on top of the quartz wool; evacuating the reaction vessel to about 750 - 760, mm Hg and sealing the vessel; and heating the vessel to between about 500 t0 700°C for, about 24 to 72 hours.
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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 July 14, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 14, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 14, 2021.
- 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.