US2590411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cerium activated aluminate phosphors active in the erythemal range
Assignee: Pollak Luminescent Corp
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Filing: 1947-12-18
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Granted: 1952-03-25
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Expires: 1967-12-18
Abstract
No abstract record available.
Inventors
- 👤 Isenberg Sampson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:46
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7721
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
51 words
AS A LUMINESCENT MATERIAL, ACTIVE IN THE ERYTHEMAL RANGE, A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ALUMINATE OF A METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, CALCIUM, STRONTIUM, BARIUM, MAGNESIUM, BERYLLIUM AND CADMIUM, AND CONTAINING CERIUM AS AN ACTIVATOR IN THE PROPORTION OF FROM ABOUT 0.05% TO 5%.
References Cited (Backward Citations)
US2116167A
Cited
US2392814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |