US3657138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visible-emitting cerium-activated calcium aluminum oxide phosphor
Assignee: RCA Licensing Corp
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Filing: 1970-01-22
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Granted: 1972-04-18
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Expires: 1990-01-22
Abstract
Abstract A PHOSPHOR CONSISTING ESSENTIALLY OF CALCIUM ALUMINUM OXIDE ACTIVATED SOLELY BY CERIUM. THE PHOSPHOR MAY BE DESCRIBED BY THE MOLECULAR FORMULA CA3AL2O6:XCE, WHEREIN X IS IN THE RANGE OF 0.0005 TO 0.1 MOLE. THE DISCLOSURE INCLUDES A CATHODE-RAY TUBE HAVING A VIEWING-SCREEN STRUCTURE COMPRISED OF THE NEW PHOSPHOR.
Inventors
- 👤 Martin Robert Royce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:50
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7721; C09K11/7716; C09K11/7718
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |