Recovery of electroluminescent phosphor from encapsulated material
CA 2363391 A1 · Owner: Klinedinst, Keith A. · Inventors: Klinedinst, Keith A.; Fan, Chen-Wen; Gingerich, Richard G.W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of recovering a base phosphor from encapsulated phosphors which , comprises the, steps of selecting a recovery vessel including a magnetic stir bar; adding to the recovery, vessel, deionized water, a first batch of concentrated hydrochloric acid and encapsulated, phosphor to form a stirred suspension; heating the stirred suspension to about 90°C for about, 2 hours; settling the stirred suspension; decanting the mother liquor and slurrying the, remaining solids with a second batch of hydrochloric acid and water; decanting and washing, the remaining solids with deionized water; filtering the remaining solids to form a filter cake;, heating the filter cake at 110°C in air for 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 November 21, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.