Patent US3573776A successfully refreshed from Google Patents.
US3573776A
Expired / Lapsed
US
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Bias cutoff trigger circuit
Assignee: United States Department of the Navy
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Filing: 1967-10-24
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Granted: 1971-04-06
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Expires: 1987-10-24
Abstract
Abstract A solid-state high temperature alarm system utilizing an off-onoff oscillator with direct current bias cutoff for use as a temperature monitor in an alarm system.
Inventors
- 👤 Donald N Dick
- 👤 Michael J Superczynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:29
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06; G08B25/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
236 words
A condition responsive system for indicating deviations above and below a normal operating zone comprising: condition responsive means having an electrical output which varies in value in accordance with deviations of said operating zone; oscillator means having first electron discharge means containing an Input terminal and an output terminal and having operating and nonoperating conditions, second electron discharge means containing an input terminal and an output terminal and having operating and nonoperating conditions, and circuit means; said condition responsive means being connected directly to said first electron discharge means and directly to said circuit means; said circuit means being electrically connected between said first electron discharge means and said second electron discharge means, whereby said circuit means enables oscillations to be produced at the output terminal of said electron discharge means for a predetermined range of the electrical output of said condition responsive means; said circuit means furthermore providing control over the frequency of oscillations of said oscillator means, the trigger points present in said oscillator means where said oscillations cut-on and cutoff, the bandwidth of the condition responsive means for which oscillations occur in said oscillator means, and the amount of hysteresis present at said trigger points of oscillation cut-on and cutoff; and a source of potential having positive and negative terminals, said positive terminal connected to said circuit means and said negative terminal connected to both said condition responsive means and said circuit means.
Claim 2
Dependent Claim
236 words
A condition responsive system for indicating deviations above and below a normal operating zone comprising: condition responsive means having an electrical output which varies in value in accordance with deviations of said operating zone; oscillator means having first electron discharge means containing an Input terminal and an output terminal and having operating and nonoperating conditions, second electron discharge means containing an input terminal and an output terminal and having operating and nonoperating conditions, and circuit means; said condition responsive means being connected directly to said first electron discharge means and directly to said circuit means; said circuit means being electrically connected between said first electron discharge means and said second electron discharge means, whereby said circuit means enables oscillations to be produced at the output terminal of said electron discharge means for a predetermined range of the electrical output of said condition responsive means; said circuit means furthermore providing control over the frequency of oscillations of said oscillator means, the trigger points present in said oscillator means where said oscillations cut-on and cutoff, the bandwidth of the condition responsive means for which oscillations occur in said oscillator means, and the amount of hysteresis present at said trigger points of oscillation cut-on and cutoff; and a source of potential having positive and negative terminals, said positive terminal connected to said circuit means and said negative terminal connected to both said condition responsive means and said circuit means.
Claim 3
Dependent Claim
107 words
A condition responsive system as recited in claim 1 wherein said circuit means includes: first subcircuit means connecting the output of said second electron discharge means in an energizing relationship to the input of said first electron discharge means and containing a variable resistance means connected between the negative terminal of said potential and in an energizing relationship with the input of said first electron discharge means; and said first subcircuit means providing positive feedback between said first and second electron discharge means, thereby causing said system to oscillate when said condition responsive means detects conditions within said normal operating zone bandwidth by said variable resistance means.
Claim 4
Dependent Claim
45 words
A condition responsive system as recited in claim 2 wherein said first and second electron discharge means being first and second transistor means respectively, and said positive feedback being between the emitter of said first transistor means and the emitter of said second transistor means.
Claim 5
Dependent Claim
95 words
A condition responsive system as recited in claim 1 wherein said circuit means includes: second subcircuit means connecting the output of said first electron discharge means to the input of said second electron discharge means; and said second subcircuit means comprising a variable capacitor in series with two parallel diodes and a shunting variable resistance means, said parallel diodes providing hysteresis, thereby preventing erratic oscillation cut-on and cutoff at said trigger points, said variable resistance means controlling the amount of hysteresis present at said trigger points and said variable capacitor controlling the frequency of oscillations.
Claim 6
Dependent Claim
72 words
A condition responsive system as recited in claim 1 wherein said circuit means includes; third subcircuit means comprising first resistance means connected between the positive terminal of said potential and the output of said first electron discharge means and second resistance means connected between the positive terminal of said potential and the input of said first electron discharge means, whereby said third subcircuit means provides biasing for said first electron discharge means.
Claim 7
Dependent Claim
107 words
A condition responsive system as recited in claim 1 wherein said circuit means includes: fourth subcircuit means comprising first resistance means connected between the positive terminal of said potential and the output of said second electron discharge means, second resistance means connected between the positive terminal of said potential and the input of said second electron discharge means, and variable third resistance means connected betweEn the negative terminal of said potential and the input of said second electron discharge means, whereby said fourth subcircuit provides biasing from said second electron discharge means; and said variable third resistance means controlling the trigger points present in said oscillator means.
Claim 8
Dependent Claim
60 words
A condition responsive system as recited in claim 1 wherein said second electron discharge means produces an oscillating output, said output having a waveform which varies from a more nonoperating-than-operating condition at one of said trigger points to a more operating-than-nonoperating condition at the other of said trigger points and has symmetry at approximately the midpoint between said trigger points.
Claim 9
Dependent Claim
96 words
A condition responsive system as recited in claim 2 wherein said circuit means further includes: second subcircuit means connecting the output of said first electron discharge means to the input of said second electron discharge means; and said second subcircuit means comprising a variable capacitor in series with two parallel diodes and a shunting variable resistance means, said parallel diodes providing hysteresis, thereby preventing erratic oscillation cut-on and cutoff at said trigger points, said variable resistance means controlling the amount of hysteresis present at said trigger points and said variable capacitor controlling the frequency of oscillations.
Claim 10
Dependent Claim
182 words
A condition responsive system as recited in claim 8 wherein said circuit means further includes; third subcircuit means comprising first resistance means connected between the positive terminal of said potential and the output of said first electron discharge means and second resistance means connected between the positive terminal of said potential and the input of said first electron discharge means, whereby said third subcircuit means provides biasing for said first electron discharge means. l0. A condition responsive system as recited in claim 9 wherein said circuit means further includes: fourth subcircuit means comprising first resistance means connected between the positive terminal of said potential and the output of said second electron discharge means, second resistance means connected between the positive terminal of said potential and the input of said second electron discharge means, and variable third resistance means connected between the negative terminal of said potential and the input of said second electron discharge means whereby said fourth subcircuit provides biasing from said second electron discharge means; and said variable third resistance means controlling the trigger points present in said oscillator means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |