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Patent US2988515A successfully refreshed from Google Patents.
US2988515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent phosphor
Assignee: Westinghouse Electric Corp
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Filing: 1958-09-29
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Granted: 1961-06-13
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Expires: 1978-09-29
Abstract
No abstract record available.
Inventors
- 👤 Wachtel Anselm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:05
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
AN ELECTROLUMINESCENT PHOSPHOR CONSISTING ESSENTIALLY OF CALCIUM SULFIDE ACTIVATED BY FROM 0.01 TO 1 MOLE PERCENT OF EUROPIUM AND FROM 0.5 TO 5 MOLE PERCENT OF COPPER.
Claim 2
Dependent Claim
27 words
AN ELECTROLUMINESCENT PHOSPHOR CONSISTING ESSENTIALLY OF CALCIUM SULFIDE ACTIVATED BY FROM 0.01 TO 1 MOLE PERCENT OF EUROPIUM AND FROM 0.5 TO 5 MOLE PERCENT OF COPPER.
References Cited (Backward Citations)
US2522074A
Cited
US2782168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |