US3655577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphors
Assignee: Hitachi Ltd
•
Filing: 1970-06-24
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Granted: 1972-04-11
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Expires: 1990-06-24
Abstract
Abstract AN OXY-SULFIDE PHOSPHOR HAVING EXTREMELY IMPROVED LUMINESCENT INTENSITY WHICH COMPRISED EUROPIUM AS A ACTIVATOR; PRASEODYMIUM OR A MIXTURE THEREOF WITH TERBIUM AS A SENSITIZER; AND A BASE HAVING A COMPOSITION CAPABLE OF MAKING THE SENSITINZING ACTIONS OF SAID ELEMENTS PARTICULARLY MARKED.
Inventors
- 👤 Tsuyoshi Kano
- 👤 Yoshiro Otomo
- 👤 Hajime Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:23
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7789
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |