Patent US2628944A successfully refreshed from Google Patents.
US2628944A
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Lead activated calcium zinc silicate phosphor and method of making same
Assignee: Westinghouse Electric Corp
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Filing: 1951-01-30
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Granted: 1953-02-17
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Expires: 1971-01-30
Abstract
No abstract record available.
Inventors
- 👤 Nagy Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:25
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/66; C09K11/666
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
66 words
A LUMINESCENT COMPOSITION PARTICULARLY ADAPTED EMITTING LONG-WAVE ULTRAVIOLET RADIATIONS, COMPRISING THE FIRED REACTIONI PRODUCT OF THE FOLLOWING CONSTITUENTS IN ABOUT THE STATED PROPORTIONS: CALCIUM COMPOUND, OXIDE EQUIVALENT, 1 TO 2.5 MOLES; CALCIUM SULPHATE, 0 TO .06 MOLE; ZINC COMPOUND, OXIDE EQUIVALENT, 2 TO 1/2 MOLE; SILICA, 2.5 TO 4 MOLES; LEAD, 0.003 TO 0.06 MOLE; WITH THE SUM OF THE CALCIUM AND ZINC EQUALLING 3 MOLES.
References Cited (Backward Citations)
US2299510A
Cited
US2471082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |