Patent US1271687A successfully refreshed from Google Patents.
US3684546A
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Method of treating luminescent rare earth oxide materials
Assignee: GTE Sylvania Inc
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Filing: 1970-02-24
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Granted: 1972-08-15
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Expires: 1990-02-24
Abstract
Abstract DISCLOSED IS A METHOD FOR PREVENTING CHROMIUM CONTAMINATION OF RARE-EARTH OXIDE PHOSPHORS BY FORMING A UNIFORM LAYER OF COLLOIDAL AMMONIUM DICHROMATE ON A SUBSTRATE BEFORE APPLYING A CHROMIUM-FREE SLURRY OF RARE-EARTH OXIDE PHOSPHOR IN AN ORGANIC BINDER TO THE SUBSTRATE.
Inventors
- 👤 Michael J Hammond
- 👤 Raymond F Herner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:33
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; C; C09; C09K; C09K11/00; C09K11/02; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |