US3868542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent display devices
Assignee: Noritake Itron Corp
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Filing: 1973-07-11
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Granted: 1975-02-25
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Expires: 1993-07-11
Abstract
Abstract In a fluorescent display device utilizing a fluorescent display tube containing a plurality of fluorescent segment electrodes, a control electrode and a heater electrode, there are provided a source with its negative pole connected to one terminal of the heater electrode, a decoder with its output connected to the segment electrodes and a pattern selection switch connected between the input terminals of the decoder and the positive pole of the source. At least one diode is connected between one of the segment electrodes and the other terminal of the heater electrode and the control electrode.
Inventors
- 👤 Mikiharu Tanji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:04
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; G; G09; G09F; G09F13/00; G09F13/26; G09F9/00; G09F9/30; G09F9/302; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
In a fluorescent display device of the type including a fluorescent display tube containing a plurality of fluorescent segment electrodes which are arranged in a predetermined pattern, a heater electrode and a control electrode disposed between said segment electrodes and said heater electrode, the improvement which comprises a source with its negative pole connected to one terminal of said heater electrode, a decoder with its output terminals connected with said segment electrodes, a pattern selection switch connected between the positive pole of said source and the input terminals of said decoder, and a diode connected between one of the output terminals of said decoder and the other terminal of said heater electrode and said control electrodes for energizing said heater electrode from said source when said one of the output terminals in energized.
Claim 2
Dependent Claim
133 words
In a fluorescent display device of the type including a fluorescent display tube containing a plurality of fluorescent segment electrodes which are arranged in a predetermined pattern, a heater electrode and a control electrode disposed between said segment electrodes and said heater electrode, the improvement which comprises a source with its negative pole connected to one terminal of said heater electrode, a decoder with its output terminals connected with said segment electrodes, a pattern selection switch connected between the positive pole of said source and the input terminals of said decoder, and a diode connected between one of the output terminals of said decoder and the other terminal of said heater electrode and said control electrodes for energizing said heater electrode from said source when said one of the output terminals in energized.
Claim 3
Dependent Claim
25 words
The fluorescent display device According to claim 1 wherein said diode is connected to the segment electrode which is energized most frequently to display patterns.
Claim 4
Dependent Claim
32 words
The fluorescent display device according to claim 1 wherein at least two diodes are connected between the segment electrodes which are energized most frequently and said control electrode and said heater electrode.
Claim 5
Dependent Claim
44 words
The fluorescent display device according to claim 1 wherein two resistors are connected in series between said control electrode and said other terminal of said heater electrode and said diode is connected between one of the segment electrodes and the juncture between said resistors.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |