US3705324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent display tubes
Assignee: Noritake Itron Corp
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Filing: 1971-09-23
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Granted: 1972-12-05
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Expires: 1991-09-23
Abstract
Abstract In a fluorescent display tube of the type comprising an insulator base having a plurality of recesses on one surface thereof which are disposed to form selected patterns to be displayed, a phosphor segment and an electrode contained in each recess and a source of electrons for impinging electrons upon the phosphor elements to cause them to luminesce there is provided a relatively low resistance path directly on the surface of the insulator base for draining electrons impinging upon the surface thereof.
Inventors
- 👤 Mitsuru Masuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:20
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
In a fluorescent display tube of the type comprising a insulator base having a plurality of recesses on one surface thereof, said recesses being disposed to form selected patterns to be displayed, a phosphor segment and an electrode contained in each of said recesses, and a source of electrons for impinging electrons upon said phosphor segments to cause them to luminesce, the improvement which comprises a relatively low resistance path provided directly on the surface of said insulator base for draining said electrons imaging upon the surface thereof.
Claim 2
Dependent Claim
88 words
In a fluorescent display tube of the type comprising a insulator base having a plurality of recesses on one surface thereof, said recesses being disposed to form selected patterns to be displayed, a phosphor segment and an electrode contained in each of said recesses, and a source of electrons for impinging electrons upon said phosphor segments to cause them to luminesce, the improvement which comprises a relatively low resistance path provided directly on the surface of said insulator base for draining said electrons imaging upon the surface thereof.
Claim 3
Dependent Claim
31 words
The fluorescent display tube according to claim 1 wherein said low resistance path is formed by a mask of metal wire net directly applied on the surface of said insulator base.
Claim 4
Dependent Claim
33 words
The fluorescent display tube according to claim 1 wherein said insulator base has a conductivity of about 3 X 105 to 108 ohm-cm at room temperature whereby to provide said low resistance path.
Claim 5
Dependent Claim
20 words
The fluorescent display tube according to claim 2 wherein said mask is provided with windows corresponding to said phosphor segments.
Claim 6
Dependent Claim
28 words
The fluorescent display tube according to claim 2 wherein said display tube is provided with an electron accelerating mesh located between said source of electrons and said mask.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |