Patent US4319873A successfully refreshed from Google Patents.
US4319873A
Expired / Lapsed
US
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Flame detection and proof control device
Assignee: American Stabilis Inc
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Filing: 1979-04-12
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Granted: 1982-03-16
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Expires: 1999-04-12
Abstract
Abstract A flame detection and proof device utilizing NAND logic implemented by MNOS devices which provides safe control of gas systems and appliances. Improved control is achieved by using a flame probe for providing signals indicative of flame and no-flame conditions connected to circuit means which includes at least one delay circuit for producing a first output signal during a set time period for ignition and also during indication of a flame condition and a second output signal after the set time period and during an indication of no-flame condition. A relay is responsive to the output of the circuit means to be activated during the first output signal and to be deactivated during the second output signal.
Inventors
- 👤 Roger P. Michaud
- 👤 Douglas B. Campbell, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:41
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/12; F23N5/123
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
139 words
A control device for use in a gas-fired system connected to a power source, said control device comprising: a probe indicating the presence of a flame in said gas-fired system; circuit means connected to said probe and including two flip-flops, a first flip-flop indicating the presence of an ignition period and a second flip-flop indicating the presence of a flame in said gas-fired system, said circuit means producing a first output signal when said flip-flops are indicating the presence of either an ignition period or a flame, and producing a second output signal at all other times; a gas valve; and relay means operatively connected to said gas valve and used to control the supply of gas in said gas-fired system, said relay means being connected to said circuit means and only being activated by said first output signal.
Claim 2
Dependent Claim
139 words
A control device for use in a gas-fired system connected to a power source, said control device comprising: a probe indicating the presence of a flame in said gas-fired system; circuit means connected to said probe and including two flip-flops, a first flip-flop indicating the presence of an ignition period and a second flip-flop indicating the presence of a flame in said gas-fired system, said circuit means producing a first output signal when said flip-flops are indicating the presence of either an ignition period or a flame, and producing a second output signal at all other times; a gas valve; and relay means operatively connected to said gas valve and used to control the supply of gas in said gas-fired system, said relay means being connected to said circuit means and only being activated by said first output signal.
Claim 3
Dependent Claim
29 words
The control device of claim 1 wherein said probe is a flame rod in which current through said flame rod is a function of a flame or no-flame condition.
Claim 4
Dependent Claim
40 words
The control device of claim 1 further including circuit breaker means connecting said device to said power source and a control circuit responsive to said circuit means to open said breaker when said circuit means produces said second output signal.
Claim 5
Dependent Claim
32 words
The control device of claim 1 wherein said circuit means includes at least one emitter follower transistor circuit which is conductive when said first output signal is produced by said circuit means.
Claim 6
Dependent Claim
37 words
The control device of claim 1 further including a gas valve responsive to said relay means, open during the first output signal of said circuit means and closed during the second output signal of said circuit means.
Claim 7
Dependent Claim
118 words
The control device of claim 1 wherein said circuit means includes a first circuit and a second circuit each of which includes a first flip-flop indicating the presence of an ignition period and a second flip-flop indicating the presence of a flame in said gas-fired system, each of said circuit means producing a first output signal when said flip-flops are indicating the presence of either an ignition period or a flame, and producing a second output signal at all other times; and wherein said device includes a detector means between said circuit means and said relay means, said detector means activating said relay means when either said first circuit or said second circuit produces a first output signal.
Claim 8
Dependent Claim
27 words
The control device of claim 6 wherein said detector circuit activates said relay means only when both said first and second circuits produce the first output signal.
Claim 9
Dependent Claim
16 words
The control device of claim 1 wherein said circuit means is comprised of CMOS logic elements.
Claim 10
Dependent Claim
195 words
A flame detection and proof control device for use in a gas-fired system operable with a power source, comprising: a probe for producing an output indicative of no-flame or flame, circuit means responsive to the output of said probe having a plurality of NAND GATES, a delay circuit for delaying signals a set time period after turn-on of said power source and at least one flip-flop responsive to said NAND GATES and delay circuit to latch the output of said circuit means at one signal level only after the set time period is completed and the probe signal output is indicative of no-flame, said circuit means also including a first circuit and a second circuit each of which respectively produces a first output signal during said set time period, a second output signal after said set time period and during a probe output indicative of no-flame, and produces said first output signal after said set time period and during a probe output indicative of flame; means for detecting the output of said circuit means; and relay means activated by said detecting means only when both said first and second circuits produce said first output signal.
Claim 11
Dependent Claim
195 words
A flame detection and proof control device for use in a gas-fired system operable with a power source, comprising: a probe for producing an output indicative of no-flame or flame, circuit means responsive to the output of said probe having a plurality of NAND GATES, a delay circuit for delaying signals a set time period after turn-on of said power source and at least one flip-flop responsive to said NAND GATES and delay circuit to latch the output of said circuit means at one signal level only after the set time period is completed and the probe signal output is indicative of no-flame, said circuit means also including a first circuit and a second circuit each of which respectively produces a first output signal during said set time period, a second output signal after said set time period and during a probe output indicative of no-flame, and produces said first output signal after said set time period and during a probe output indicative of flame; means for detecting the output of said circuit means; and relay means activated by said detecting means only when both said first and second circuits produce said first output signal.
Claim 12
Dependent Claim
52 words
The flame detection and proof control device of claim 8 further including a circuit breaker connected in series with said power source and a control circuit responsive to said output of said circuit means to open said circuit breaker when said output of the circuit means is at said one signal level.
Claim 13
Dependent Claim
189 words
A control device for use in a gas-fired system connected to a power source, said control device comprising: a probe indicating the presence of a flame in said gas-fired system; circuit means connected to said probe and including two flip-flops, a first flip-flop indicating the presence of an ignition period and a second flip-flop indicating the presence of a flame in said gas-fired system, said circuit means producing a first output signal when said flip-flops are indicating the presence of either an ignition period or a flame, and producing a second output signal at all other times; relay means used to control the supply of gas in said gas-fired system, said relay means being connected to said circuit means and only being activated by said first output signal; circuit breaker means connecting said device to said power source; p1 a control circuit responsive to said circuit means to open said circuit breaker means when said circuit means produces said second output signal; and a first delay circuit connected to the control circuit of said circuit breaker means for holding said circuit breaker means closed during a set time period.
Claim 14
Dependent Claim
189 words
A control device for use in a gas-fired system connected to a power source, said control device comprising: a probe indicating the presence of a flame in said gas-fired system; circuit means connected to said probe and including two flip-flops, a first flip-flop indicating the presence of an ignition period and a second flip-flop indicating the presence of a flame in said gas-fired system, said circuit means producing a first output signal when said flip-flops are indicating the presence of either an ignition period or a flame, and producing a second output signal at all other times; relay means used to control the supply of gas in said gas-fired system, said relay means being connected to said circuit means and only being activated by said first output signal; circuit breaker means connecting said device to said power source; p1 a control circuit responsive to said circuit means to open said circuit breaker means when said circuit means produces said second output signal; and a first delay circuit connected to the control circuit of said circuit breaker means for holding said circuit breaker means closed during a set time period.
Claim 15
Dependent Claim
25 words
The device of claim 11 further including a second delay circuit for setting the time period of the control circuit for said circuit breaker means.
References Cited (Backward Citations)
US2403411A
Cited
US2981324A
Cited
US3115180A
Cited
US3155145A
Cited
US3223138A
Cited
US3263731A
Cited
US3266551A
Cited
US3376099A
Cited
US3447880A
Cited
US3405998A
Cited
US3449055A
Cited
US3614280A
Cited
US3644074A
Cited
US3727073A
Cited
US3930783A
Cited
US3671169A
Cited
US3705783A
Cited
US3732433A
Cited
US3801800A
Cited
US3852729A
Cited
US3816053A
Cited
US3830619A
Cited
US3872320A
Cited
US3854056A
Cited
US3892981A
Cited
US3935473A
Cited
US3840322A
Cited
US3918881A
Cited
US3895241A
Cited
US3905748A
Cited
US4086048A
Cited
US3975136A
Cited
US4000961A
Cited
US4025283A
Cited
US4113419A
Cited
US4077762A
Cited
US4073611A
Cited
US4082493A
Cited
US4140474A
Cited
US4239478A
Cited
US4137428A
Cited
US4145180A
Cited
US4188181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |