US3737705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent alphanumeric indicating tube having plural fluorescent layers
Assignee: Toshiba Corp
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Filing: 1971-12-14
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Granted: 1973-06-05
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Expires: 1991-12-14
Abstract
Abstract A luminescent alphanumeric indicating tube comprising an array of fluorescent segments formed on one surface of an insulating substrate, each segment including a carbon layer coated on the surface of the substrate and a first fluorescent layer interposed between the carbon layer and a second fluorescent layer, the first layer consisting fluorescent particles whose diameter is nearly equal to or smaller than that of the particles constituting the carbon layer and the second layer consisting of fluorescent particles whose diameter is larger than that of the particles consistuting the first fluorescent layer.
Inventors
- 👤 M Takeda
- 👤 H Miyano
- 👤 H Nagaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:35
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15; H01J29/00; H01J29/02; H01J29/10; H01J29/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A luminescent alphanumeric indicating tube according to claim 1 wherein said first and second layers of fluorescent materials substantially do not include any metal ion.
Claim 2
Dependent Claim
49 words
A luminescent alphanumeric indicating tube according to claim 1 wherein said first fluorescent layer is substantially composed of particles of fluorescent materials having a smaller diameter than two microns, and said second fluorescent layer is substantially comprised of particles of fluorescent materials having a larger diameter than two microns.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |