US4405299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burner ignition and flame monitoring system
Assignee: Honeywell Inc
•
Filing: 1981-07-24
•
Granted: 1983-09-20
•
Expires: 2001-07-24
Abstract
Abstract A fuel burner ignition system using a hot surface ignitor means as both an ignition element and as one element of a flame rectification sensor. The hot surface ignitor means ignites fuel issuing from a fuel burner, and also acts as the flame rod or sensing means of a flame detecting system.
Inventors
- 👤 Stephen L. Serber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:54
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/12; F23N5/123; F23Q; F23Q7/00; F23Q7/06; F23Q7/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
202 words
A burner ignition and flame monitoring system adapted to control a fuel burner in response to a condition responsive means, including: hot surface ignitor means adapted to be mounted in proximity to said fuel burner to ignite fuel issuing from said fuel burner; first power source means connected to said hot surface ignitor means in series circuit with an ignitor control switch to controllably energize said ignitor means to generate an ignition temperature at said ignitor means; flame sensing circuit means adapted to be connected to and operatively energized from alternating current power source means concurrently with the energization of said hot surface igniter means; said ignitor means being connected to said flame sensing circuit means with said flame sensing circuit means being responsive to the presence or absence of flame between said ignitor means and said burner by said flame effectively rectifying said alternating current power source means; primary control means connected to said flame sensing circuit means and being responsive to the presence or absence of said flame at said burner; and switch control means operated by said primary control means to in turn operate said ignitor control switch to deenergize said hot surface igniter means when flame is sensed.
Claim 2
Dependent Claim
202 words
A burner ignition and flame monitoring system adapted to control a fuel burner in response to a condition responsive means, including: hot surface ignitor means adapted to be mounted in proximity to said fuel burner to ignite fuel issuing from said fuel burner; first power source means connected to said hot surface ignitor means in series circuit with an ignitor control switch to controllably energize said ignitor means to generate an ignition temperature at said ignitor means; flame sensing circuit means adapted to be connected to and operatively energized from alternating current power source means concurrently with the energization of said hot surface igniter means; said ignitor means being connected to said flame sensing circuit means with said flame sensing circuit means being responsive to the presence or absence of flame between said ignitor means and said burner by said flame effectively rectifying said alternating current power source means; primary control means connected to said flame sensing circuit means and being responsive to the presence or absence of said flame at said burner; and switch control means operated by said primary control means to in turn operate said ignitor control switch to deenergize said hot surface igniter means when flame is sensed.
Claim 3
Dependent Claim
40 words
A burner ignition and flame monitoring system as disclosed in claim 1 wherein said first and said alternating current power source means include two secondary windings of transformer means adapted to be connected to a source of alternating current potential.
Claim 4
Dependent Claim
34 words
A burner ignition and flame monitoring system as disclosed in claim 2 wherein said ignitor control switch is a relay contact; and said switch control means includes a relay which operates said relay contact.
Claim 5
Dependent Claim
27 words
A burner ignition and flame monitoring system as disclosed in claim 3 wherein said flame sensing circuit means is a flame rectification type of flame sensing circuit.
Claim 6
Dependent Claim
21 words
A burner ignition and flame monitoring system as disclosed in claim 4 wherein said hot surface ignitor means is a resistor.
Claim 7
Dependent Claim
21 words
A burner ignition and flame monitoring system as disclosed in claim 5 wherein said resistor is a negative temperature coefficient resistor.
Claim 8
Dependent Claim
24 words
A burner ignition and flame monitoring system as disclosed in claim 6 wherein said fuel issuing from said fuel burner is a gaseous fuel.
Claim 9
Dependent Claim
32 words
A burner ignition and flame monitoring system as disclosed in claim 2 wherein said flame rectification type of flame sensing circuit and said primary control means are solid state electronic circuit means.
Claim 10
Dependent Claim
34 words
A burner ignition and flame monitoring system as disclosed in claim 8 wherein said ignitor control switch is a relay contact; and said switch control means includes a relay which operates said relay contact.
Claim 11
Dependent Claim
27 words
A burner ignition and flame monitoring system as disclosed in claim 9 wherein said flame sensing circuit means is a flame rectification type of flame sensing circuit.
References Cited (Backward Citations)
US3454345A
Cited
US3385648A
Cited
US3551084A
Cited
US3594107A
Cited
US3619096A
Cited
US3826605A
Cited
US4056348A
Cited
US4188181A
Cited
US4298335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |