US4899081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent display device
Assignee: Futaba Corp
•
Filing: 1988-09-30
•
Granted: 1990-02-06
•
Expires: 2008-09-30
Abstract
Abstract A fluorescent display device capable of eliminating a display defect and exhibiting high luminance to improve quality of a luminous display and provide the display with good visibility. The fluorescent display device is the plane grid type and includes, in place of mesh-like grids, plane grids of a three-layer structure comprising metal film sections, insulating layer sections and conductive layer sections.
Inventors
- 👤 Takao Kishino
- 👤 Minoru Katayama
- 👤 Kazuyuki Yano
- 👤 Isao Ohtsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:52
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/12; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A fluorescent display device comprising: an insulating substrate; phosphor-deposited anodes arranged on said insulating substrate; grids arranged on said insulating substrate in proximity to said anodes; filamentary cathodes stretched above said anodes; said grids each being constituted by a metal film section arranged on said substrate, an insulating layer section laminatedly arranged on said metal film section in a manner to expose a peripheral portion of said metal film section surrounding said anode and a conductive layer section laminatedly arranged on said insulating layer section so as to be electrically connected to said metal film section.
Claim 2
Dependent Claim
96 words
A fluorescent display device comprising: an insulating substrate; phosphor-deposited anodes arranged on said insulating substrate; grids arranged on said insulating substrate in proximity to said anodes; filamentary cathodes stretched above said anodes; said grids each being constituted by a metal film section arranged on said substrate, an insulating layer section laminatedly arranged on said metal film section in a manner to expose a peripheral portion of said metal film section surrounding said anode and a conductive layer section laminatedly arranged on said insulating layer section so as to be electrically connected to said metal film section.
Claim 3
Dependent Claim
33 words
A fluorescent display device as defined in claim 1, wherein electrical connection between said metal film section and said conductive layer section is carried out via through-holes formed at said insulating layer section.
Claim 4
Dependent Claim
24 words
A fluorescent display device as defined in claim 1, wherein said conductive layer section is provided in a manner to project from said anode.
References Cited (Backward Citations)
US4542317A
Cited
US4763041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |