Patent US3600631A successfully refreshed from Google Patents.
US3600631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optional high voltage booster circuit for indicator tube
Assignee: Unisys Corp
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Filing: 1968-07-02
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Granted: 1971-08-17
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Expires: 1988-07-02
Abstract
Abstract The disclosure is of a circuit for driving an indicator tube of the type including an anode and a plurality of glow cathode electrodes. The circuit includes a normal anode power supply and an auxiliary circuit for increasing the voltage supplied to the anode of the tube by a fractional amount of the voltage supplied by the normal power supply during periods when the normal power supply is insufficient to fire the tube.
Inventors
- 👤 Arthur F Cake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:33
CPC Classifications
H; H03; H03K; H03K21/00; H03K21/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
208 words
A circuit for firing a gas discharge device having at least one pair of electrodes comprising: a first current path including a first electronic switch connected to one electrode of said pair of electrodes through a unidirectional device for connecting a positive potential source to said one electrode; a second current path including a second electrode switch connected to said one electrode through a capacitor for connecting a ground potential source to said one electrode; a first resistor shunting said first switch in said first current path; a second resistor connected between the first electronic switch and the unidirectional device in said first current path and between the capacitor and second electronic switch in said second current path; and means interacting with said second resistor for causing the first electronic switch to close when said second electronic switch is opened and open when said second electronic switch is closed, whereby said capacitor is charged to a fraction of the potential of said potential source when said first electronic switch is open and said second switch is closed and is connected to the positive potential source in a series aiding relationship when said second switch is open and said first switch is closed and said discharge device is nonconducting.
Claim 2
Dependent Claim
208 words
A circuit for firing a gas discharge device having at least one pair of electrodes comprising: a first current path including a first electronic switch connected to one electrode of said pair of electrodes through a unidirectional device for connecting a positive potential source to said one electrode; a second current path including a second electrode switch connected to said one electrode through a capacitor for connecting a ground potential source to said one electrode; a first resistor shunting said first switch in said first current path; a second resistor connected between the first electronic switch and the unidirectional device in said first current path and between the capacitor and second electronic switch in said second current path; and means interacting with said second resistor for causing the first electronic switch to close when said second electronic switch is opened and open when said second electronic switch is closed, whereby said capacitor is charged to a fraction of the potential of said potential source when said first electronic switch is open and said second switch is closed and is connected to the positive potential source in a series aiding relationship when said second switch is open and said first switch is closed and said discharge device is nonconducting.
Claim 3
Dependent Claim
43 words
The circuit of claim 1 wherein said first and second electronic switches comprise first and second transistors and wherein said means comprises a current path from said second current path between the capacitor and second switch to the gate of said first transistor.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |