US3764840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp providing visible light and dorno rays
Assignee: Toshiba Corp
•
Filing: 1972-06-02
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Granted: 1973-10-09
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Expires: 1992-06-02
Abstract
Abstract The fluorescent lamp comprises a bulb and a layer consisting of a first fluorescent substance having the principal luminous spectrum in the visible ray region and a second fluorescent substance having the principal luminous spectrum in the Dorno ray range. The proportion of the first and second fluorescent substances is selected to radiate visible light fluxes and Dorno ray fluxes at a ratio substantially equal to that of the natural day light. The bulb has a thickness about 0.8mm and is composed of a soda-lime glass which does not transmit radiations of the wave length less than 295nm.
Inventors
- 👤 H Shiraishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:25
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/302; H01J61/38; H01J61/42; H01J61/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
The fluorescent lamp according to claim 1 wherein said layer consists of a mixture of said first and second fluorescent substances.
Claim 2
Dependent Claim
30 words
The fluorescent lamp according to claim 1 wherein said first fluorescent substance comprises calcium halophosphate activated by antimony-manganese and said second fluorescent substance comprises zinc-calcium phosphate activated by the thallium.
Claim 3
Dependent Claim
28 words
The fluorescent lamp according to claim 1 wherein the soda-lime glass comprises SiO2, R2O3, CaO, MgO and R''2O bearing the ratio of 72:2:6:3:17 based on parts by weight.
Claim 4
Dependent Claim
27 words
The fluorescent lamp according to claim 1 wherein the soda-lime glass comprises SiO2, R2O3, R''2O and PbO bearing the ratio of 58:1:13:28 based on parts by weight.
Claim 5
Dependent Claim
30 words
The fluorescent lamp according to claim 1 wherein the soda-lime glass comprises SiO2, R2O3, CaO, MgO, R''2O, As2O5 and Sb2O3 bearing the ratio of 69.9:1.98:0.4:3.5:17.32:0.9:0.49 based on parts by weight.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |