US3569762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge lamps with rare earth phosphor coating
Assignee: Verizon Laboratories Inc
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Filing: 1964-07-01
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Granted: 1971-03-09
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Expires: 1984-07-01
Abstract
Abstract A FLUORESCENT ELECTRIC DISCHARGE LAMP COMPRISING (A) AN ARC TUBE DISCHARGE SOURCE, (B) A TRANSPARENT OUTER ENVELOPE SURROUNDING SAID DISCHARGE SOURCE, AND (C) A PHOSPHOR COATING ON THE INSIDE SURFACE OF SAID OUTER ENVELOPE, SAID PHOSPHOR BEING COMPOSED OF A HOST CRYSTAL CONSISTING ESSENTIALLY OF A VANADATE OF A TRIVALENT METAL SELECTED FROM THE GROUP CONSISTING OF YTTRIUM, GADOLINIUM AND LUTETIUM, SAID HOST CRYSTAL BEING ACTIVATED BY A TRIVALENT RARE-EARTH ELEMENT SELECTED FROM THE GROUP CONSISTING OF EUROPIUM AND SAMARIUM.
Inventors
- 👤 Albert K Levine
- 👤 Frank C Palilla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:41
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7776
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |