US3571648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extra high output and high output fluorescent lamps
Assignee: Toshiba Corp
•
Filing: 1968-12-26
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Granted: 1971-03-23
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Expires: 1988-12-26
Abstract
Abstract An extra high output or high output fluorescent lamp comprises first and second fluorescent layers superposed on each other. The first fluorescent layer contains at least 10 percent by weight of manganese activated magnesium fluorogermanate on the basis of the entire first layer. The second fluorescent layer consists of calcium halophosphate activated by antimony and manganese. The aforementioned fluorescent lamp displays a reduced attenuation of luminous fluxes relative to operating duration.
Inventors
- 👤 Teizo Hanada
- 👤 Akira Someya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:56
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/48; C; C09; C09K; C09K11/00; C09K11/08; C09K11/66; C09K11/74; C09K11/75; C09K11/76
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
45 words
A fluorescent lamp according to claim 1 wherein said first fluorescent layer further contains at least one fluorescent material selected from the group consisting of manganese-activated magnesium boroarsenate and manganese-activated arsenate, the weight percentage of the manganese-activated magnesium fluorogermanate accounting for at least 10 percent.
Claim 2
Dependent Claim
16 words
A fluorescent lamp according to claim 1 wherein said first fluorescent layer is 20 microns thick.
Claim 3
Dependent Claim
16 words
A fluorescent lamp according to claim 1 wherein said second fluorescent layer is 10 microns thick.
Claim 4
Dependent Claim
19 words
A fluorescent lamp according to claim 1, wherein said inert gas comprises a mixture of helium, neon and argon.
Claim 5
Dependent Claim
30 words
A fluorescent lamp according to claim 1 wherein said inert gas comprises a mixture of 5 percent helium, 38 percent neon, and 57 percent argon, said percentages being by volume.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |