Patent US2683693A successfully refreshed from Google Patents.
US2683693A
Expired / Lapsed
US
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Zinc-magnesium oxide luminescent materials
Assignee: RCA Corp
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Filing: 1951-02-14
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Granted: 1954-07-13
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Expires: 1971-02-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Philip R Celmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:59
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7701
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A LUMINESCENT MATERIAL COMPRISING MAGNESIUM OXIDE IN SOLID SOLUTION IN ZINC OXIDE, THE RATIO OF ZINC OXIDE TO MAGNESIUM OXIDE BEING WITHIN THE RANGE OF 19:1 AND 2:3, AND INCLUDING ONE OF THE ELEMENTS SELECTED FROM THE CLASS CONSISTING OF SCANDIUM, YTTRIUM, LANTHANUM, AND EUROPIUM IN ACTIVATOR PROPORTIONS.
Claim 2
Dependent Claim
48 words
A LUMINESCENT MATERIAL COMPRISING MAGNESIUM OXIDE IN SOLID SOLUTION IN ZINC OXIDE, THE RATIO OF ZINC OXIDE TO MAGNESIUM OXIDE BEING WITHIN THE RANGE OF 19:1 AND 2:3, AND INCLUDING ONE OF THE ELEMENTS SELECTED FROM THE CLASS CONSISTING OF SCANDIUM, YTTRIUM, LANTHANUM, AND EUROPIUM IN ACTIVATOR PROPORTIONS.
References Cited (Backward Citations)
US2481344A
Cited
US2544236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |