Patent US4298823A successfully refreshed from Google Patents.
US4298823A
Expired / Lapsed
US
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Fluorescent display device
Assignee: Futaba Corp
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Filing: 1979-11-16
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Granted: 1981-11-03
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Expires: 1999-11-16
Abstract
Abstract A fluorescent display device is disclosed having a grid which is divided into several pieces electrically separated and disposed in close proximity and in an opposed relationship at the edges thereof. The grids are held in position within the display device by an elongated insulator which bridges the respective opposed edges of the grids and a sealing portion around the periphery of the display device.
Inventors
- 👤 Kishio Kawasaki
- 👤 Takao Kishino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:57
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
A fluorescent display device comprising: a vacuum casing made up of a substrate and a front cover airtightly bonded together; a pattern display section composed of a plurality of anodes each coated with a phosphor layer on the upper surfaces thereof and disposed on said substrate; a plurality of control electrodes electrically isolated one after another and mounted above said pattern display section, said control electrodes being secured to spacer frames and at least some of said control electrodes being arranged in an opposite relationship making edges of said spacer frames adjacent; a filamentary cathode stretched above said control electrodes for emitting thermions to be selectively impinged on said anodes to effect luminous display of letters or figures; and an elongated insulator mounted on at least two adjacent control electrodes along the opposed edges of said spacer frames, whereby each of the control electrodes is connected together at the opposed edges of said spacer frames by means of said insulator.
Claim 2
Dependent Claim
160 words
A fluorescent display device comprising: a vacuum casing made up of a substrate and a front cover airtightly bonded together; a pattern display section composed of a plurality of anodes each coated with a phosphor layer on the upper surfaces thereof and disposed on said substrate; a plurality of control electrodes electrically isolated one after another and mounted above said pattern display section, said control electrodes being secured to spacer frames and at least some of said control electrodes being arranged in an opposite relationship making edges of said spacer frames adjacent; a filamentary cathode stretched above said control electrodes for emitting thermions to be selectively impinged on said anodes to effect luminous display of letters or figures; and an elongated insulator mounted on at least two adjacent control electrodes along the opposed edges of said spacer frames, whereby each of the control electrodes is connected together at the opposed edges of said spacer frames by means of said insulator.
Claim 3
Dependent Claim
23 words
The fluorescent display device as defined in claim 1, wherein said elongated insulator is secured to either one of said adjoining spacer frames.
Claim 4
Dependent Claim
23 words
The fluorescent display device as defined in claim 1, wherein at least one of said spacer frames includes hook for catching said insulator.
References Cited (Backward Citations)
US4190787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |