Patent USRE28592E successfully refreshed from Google Patents.
USRE28592E
Expired / Lapsed
US
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Terbium activated rare earth oxyhalide phosphors containing ytterbium for reduced afterglow
Assignee: —
•
Filing: 1974-05-20
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Granted: 1975-10-28
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Expires: 1994-05-20
Abstract
Abstract Phosphors of reduced afterglow having the inclusion of a selected impurity in the phosphors lattice. More specifically, rare earth oxyhalide phosphors of reduced phosphorescence comprising lanthanum and gadolinium oxyhalide phosphors activated with terbium including the selected impurity ytterbium.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:34
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/777
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
A RARE EARTH OXYHALIDE PHOSPHOR OF REDUCED AFTERGLOW HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
12 words
A RARE EARTH OXYHALIDE PHOSPHOR OF REDUCED AFTERGLOW HAVING THE GENERAL FORMULA:
Claim 3
Dependent Claim
25 words
A rare earth oxyhalide phosphor of reduced afterglow according to claim 1 wherein: M is La X is Br w is 0.002 y is 0.0005.
References Cited (Backward Citations)
US3546128A
Cited
US3607770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |