US4908603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light emitting alarm board
Assignee: Individual
•
Filing: 1989-04-11
•
Granted: 1990-03-13
•
Expires: 2009-04-11
Abstract
Abstract A light-emitting alarm board uses thin-film EL elements which emit light of different colors individually or simultaneously, depending on the voltages applied thereon, thereby serving as display lamps for indicating the conditions of operation of a system being monitored.
Inventors
- 👤 Satoshi Yamaue
- 👤 Koichi Tanaka
- 👤 Hiroaki Nakaya
- 👤 Takuo Yamashita
- 👤 Masaru Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:22
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; G; G08; G08B; G08B5/00; G08B5/22; G08B5/36; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A light-emitting alarm board comprising a board, and a plurality of thin-film EL elements adapted to emit light of different colors according to voltages applied thereon, said EL elements being stacked on said board and one on top of another in the direction of light emission therefrom, each of said EL elements being provided with an electrode terminal such that one or more of said EL elements can be selectably caused to emit light of one of said different colors or an intermediate color of said different colors, said alarm board thereby serving as display lamps for indicating the condition of operation of a system being monitored.
Claim 2
Dependent Claim
107 words
A light-emitting alarm board comprising a board, and a plurality of thin-film EL elements adapted to emit light of different colors according to voltages applied thereon, said EL elements being stacked on said board and one on top of another in the direction of light emission therefrom, each of said EL elements being provided with an electrode terminal such that one or more of said EL elements can be selectably caused to emit light of one of said different colors or an intermediate color of said different colors, said alarm board thereby serving as display lamps for indicating the condition of operation of a system being monitored.
Claim 3
Dependent Claim
25 words
The light-emitting alarm board of claim 1 wherein each of said thin-film EL elements comprises a light-emitting layer and insulating layers sandwiching said light-emitting layer.
Claim 4
Dependent Claim
26 words
The light-emitting alarm board of claim 1 wherein said plurality of thin-film EL elements are mutually separated by a transparent conductive layer serving as an electrode.
Claim 5
Dependent Claim
23 words
The light-emitting alarm board of claim 1 wherein each of said thin-film EL elements serves to display a pattern in a selected color.
Claim 6
Dependent Claim
12 words
The light-emitting alarm board of claim 1 comprising two thin-film EL elements.
Claim 7
Dependent Claim
34 words
The light-emitting alarm board of claim 5 wherein said different colors are red and green, said light-emitting alarm board being adapted to selectably emit light of red, green, yellowish orange, yellow and yellowish green.
References Cited (Backward Citations)
US4666793A
Cited
US4741976A
Cited
US4717858A
Cited
US4727004A
Cited
US4717606A
Cited
US4730146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |