US3586636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Europium activated vanadate phosphors with tantalum and/or niobium additive
Assignee: Hitachi Ltd
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Filing: 1968-11-25
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Granted: 1971-06-22
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Expires: 1988-11-25
Abstract
Abstract EUROPIUM ACTIVATED YTTRIUM, GADOLINIUM AND YTTRIUMGADOLINIUM VANADATE PHOSPHORS ARE DOPED WITH TA, NB, OR EITHER TA, NB, OR TA-NB OPRIONALLY WITH SI, AND ARE USEFUL AS RED COLOR-EMITTING PHOSPHOR FOR HIGH-PRESSURE MERCURY LAMPS.
Inventors
- 👤 Tsuyoshi Kano
- 👤 Yoshiro Otomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:46
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7794
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |