US3833336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote fire stack igniter
Assignee: National Aeronautics and Space Administration
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Filing: 1973-08-29
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Granted: 1974-09-03
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Expires: 1993-08-29
Abstract
Abstract An igniter mounted on a vent stack with an upper, flame cage near the top of the stack to ignite emissions from the stack. The igniter is a tube with a lower, open, flared end having a spark plug near the lower end and a solenoid-controlled valve which supplies propane fuel from a supply tank. Propane from the tank is supplied at the top under control of a second, solenoidcontrolled valve. The valve controlling the lower supply is closed after ignition at the flame cage. The igniter is economical, practical, and highly reliable.
Inventors
- 👤 W Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:48
CPC Classifications
F; F23; F23Q; F23Q3/00; F23Q3/008; F23G; F23G7/00; F23G7/06; F23G7/08; F23D; F23D2207/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
132 words
A vent igniter capable of burning waste gases at near atmospheric pressure comprising an elongated tube open at both ends adapted to be attached along a vent stack the emissions of which are to be ignited, a continuous fixed flow source of combustible fuel under pressure, said fuel source being separate and independent of said emissions to be ignited first fuel output means positioned near one end of said tube, second fuel output means positioned near the other end of said tube, conduit means for said fuel connecting said fuel source to said first and said second fuel output means, combustion initiating means located near said first fuel output means, control valve means to control fuel to said first fuel output means, and control means to selectively activate said combustion initiating means.
Claim 2
Dependent Claim
132 words
A vent igniter capable of burning waste gases at near atmospheric pressure comprising an elongated tube open at both ends adapted to be attached along a vent stack the emissions of which are to be ignited, a continuous fixed flow source of combustible fuel under pressure, said fuel source being separate and independent of said emissions to be ignited first fuel output means positioned near one end of said tube, second fuel output means positioned near the other end of said tube, conduit means for said fuel connecting said fuel source to said first and said second fuel output means, combustion initiating means located near said first fuel output means, control valve means to control fuel to said first fuel output means, and control means to selectively activate said combustion initiating means.
Claim 3
Dependent Claim
85 words
The vent igniter as in claim 1 also comprising a cage adapted to protect fire burning at the end of said tube from fuel from said second fuel output means from influences of the atmosphere, said cage comprising a perforated shield member surrounding the area immediately beyond said tube near said second fuel output means and a continuous member generally perpendicular to the long axis of said tube mounted near said perforated member with said perforated member located between said continuous member and said tube.
Claim 4
Dependent Claim
39 words
The vent igniter as in claim 1 in which the open end of said tube near said first fuel output means is flareD outward, and said first fuel output means is mounted in the center of said flared part.
Claim 5
Dependent Claim
150 words
A vent igniter comprising an elongated tube open at both ends adapted to be attached along a vent stack the emissions of which are to be ignited; a continuous source of combustible fuel under pressure; first fuel output means positioned near one end of said tube; second fuel output means positioned near the other end of said tube; conduit means for said fuel connecting said fuel source to said first and second fuel output means; combustion initiating means located near said first fuel output means; control valve means to control fuel to said first fuel output means; control means to selectively activate said combustion initiating means; and a manually activated relay adapted to close two electrical circuits, one of said circuits activating said combustion initiating means and the other of said circuits activating a solenoid circuit to said control valve means to control fuel to said first fuel output means.
Claim 6
Dependent Claim
150 words
A vent igniter comprising an elongated tube open at both ends adapted to be attached along a vent stack the emissions of which are to be ignited; a continuous source of combustible fuel under pressure; first fuel output means positioned near one end of said tube; second fuel output means positioned near the other end of said tube; conduit means for said fuel connecting said fuel source to said first and second fuel output means; combustion initiating means located near said first fuel output means; control valve means to control fuel to said first fuel output means; control means to selectively activate said combustion initiating means; and a manually activated relay adapted to close two electrical circuits, one of said circuits activating said combustion initiating means and the other of said circuits activating a solenoid circuit to said control valve means to control fuel to said first fuel output means.
Claim 7
Dependent Claim
193 words
A vent igniter comprising an elongated tube open at both ends adapted to be attached along a vent stack the emissions of which are to be ignited; a continuous source of combustible fuel under pressure; first fuel output means positioned near one end of said tube; second fuel output means positioned near the other end of said tube; conduit means for said fuel connecting said fuel source to said first and second fuel output means; combustion initiating means located near said first fuel output means; control valve means to control fuel to said first fuel output means; control means to selectively activate said combustion initiating means; and wherein said source of combustible fuel is a source of hydrocarbon gas, said combustion initiating means is a spark plug, and said source of hydrocarbon gas is connected by a first conduit to a normally open solenoid valve, the output of said normally open valve is connected to said second fuel output means by a second conduit and is connected to a normally closed solenoid valve by a third conduit, and the output of said normally closed valve is connected to said first fuel output means.
Claim 8
Dependent Claim
193 words
A vent igniter comprising an elongated tube open at both ends adapted to be attached along a vent stack the emissions of which are to be ignited; a continuous source of combustible fuel under pressure; first fuel output means positioned near one end of said tube; second fuel output means positioned near the other end of said tube; conduit means for said fuel connecting said fuel source to said first and second fuel output means; combustion initiating means located near said first fuel output means; control valve means to control fuel to said first fuel output means; control means to selectively activate said combustion initiating means; and wherein said source of combustible fuel is a source of hydrocarbon gas, said combustion initiating means is a spark plug, and said source of hydrocarbon gas is connected by a first conduit to a normally open solenoid valve, the output of said normally open valve is connected to said second fuel output means by a second conduit and is connected to a normally closed solenoid valve by a third conduit, and the output of said normally closed valve is connected to said first fuel output means.
Claim 9
Dependent Claim
40 words
The vent igniter as in claim 12 also comprising a manually operated relay adapted to close two electrical circuits, one of said circuits activating said combustion initiating means and the other of said circuits activating said normally closed solenoid valve.
Claim 10
Dependent Claim
52 words
The vent igniter as in claim 6 in which a first, manual adjustment valve is located in the conduit between said normally open solenoid and said first fuel output means and a second, manual adjustment valve is located in the circuit between said normally open solenoid and said second fuel output means.
Claim 11
Dependent Claim
85 words
The vent igniter as in claim 7 also comprising a cage adapted to protect fire burning at the end of said tube from fuel from said second fuel output means for influences of the atmosphere, said cage comprising a perforated shield member surrounding the area immediately beyond said tube near said second fuel output means and a continuous member generally perpendicular to the long axis of said tube mounted near said perforated member with said perforated member located between said continuous member and said tube.
Claim 12
Dependent Claim
39 words
The vent igniter as in claim 8 in which the open end of said tube near said first fuel output means is flared outward, and said first fuel output means is mounted in the center of said flared part.
Claim 13
Dependent Claim
19 words
The vent igniter as in claim 9 wherein said source of combustible fuel is a container of liquified propane.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |