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US3748516A
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Low-pressure mercury vapour discharge lamp
Assignee: US Philips Corp
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Filing: 1971-02-16
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Granted: 1973-07-24
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Expires: 1991-02-16
Abstract
Abstract Luminescent material for a low-pressure mercury vapor lamp consisting essentially of a europium activated strontium or barium boro-phosphate.
Inventors
- 👤 G Blasse
- 👤 Vries J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:57
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7737; C09K11/7738; C09K11/774
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
33 words
The low-pressure mercury vapor discharge lamp of claim 1 wherein the alkaline earth boro-phosphate activated by bivalent europium has the formula Ba1 pEupBPO5 wherein 0.003 < or = p < or = 0.15.
Claim 2
Dependent Claim
19 words
The low-pressure mercury vapor discharge lamp of claim 1 wherein 0.005 < or = p < or = 0.05.
Claim 3
Dependent Claim
19 words
The low-pressure mercury vapor discharge lamp of claim 2 wherein 0.005 < or = p < or = 0.05.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |