US4521180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laboratory burner apparatus
Assignee: Kidde Fenwal Inc
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Filing: 1984-06-11
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Granted: 1985-06-04
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Expires: 2004-06-11
Abstract
Abstract A laboratory gas burner and control apparatus including a burner assembly made from electrically conductive material and adapted for positioning on a counter. Defined by the burner is an inlet for connection to a gas source and an outlet for feeding gas to a flame. An electrically operated valve controls the flow of gas to the burner outlet and an igniter is energizable by a power supply to ignite gas emanating from the burner outlet. Associated with the igniter is an activation circuit that produces either ignition periods during which the igniter is energized by the supply or non-ignition periods during which the igniter is deenergized. Initiation of each ignition period requires manipulation of a manual activation mechanism. Once ignited, the presence of flame at the burner outlet is detected by a flame sensing mechanism. A valve control circuit maintains the supply valve open only during either ignition periods or periods during which flame is detected by the sensing mechanism.
Inventors
- 👤 Carl W. Walter
- 👤 William J. Riordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:53
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/12; F23N5/123; F23N2227/00; F23N2227/36; F23N2235/00; F23N2235/12; F23N2235/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
193 words
Laboratory burner apparatus comprising: a burner made from electrically conductive material and adapted for positioning on a counter, said burner comprising an inlet for connection to a gas source and an outlet for feeding gas to a flame; an electrical power supply comprising an AC supply having hot, neutral, and ground terminals; an electrically operated valve for controlling the flow of fuel to said burner; an igniter means energizable by said supply to ignite fuel emanating from said outlet; igniter activation means for producing either ignition periods during which said igniter means is energized by said supply or non-ignition periods during which said igniter is deenergized, said activation means comprising manual activation means for initiating each of said ignition periods; said igniter activation means further comprising ground proving means for insuring the integrity of said ground terminal prior to each said ignition period, whereby said igniter means is not energized in the absence of a ground connection; flame sensing means for detecting the presence of flame at said outlet; and valve control means for opening said valve only during said ignition periods and periods during which flame is detected by said sensing means.
Claim 2
Dependent Claim
193 words
Laboratory burner apparatus comprising: a burner made from electrically conductive material and adapted for positioning on a counter, said burner comprising an inlet for connection to a gas source and an outlet for feeding gas to a flame; an electrical power supply comprising an AC supply having hot, neutral, and ground terminals; an electrically operated valve for controlling the flow of fuel to said burner; an igniter means energizable by said supply to ignite fuel emanating from said outlet; igniter activation means for producing either ignition periods during which said igniter means is energized by said supply or non-ignition periods during which said igniter is deenergized, said activation means comprising manual activation means for initiating each of said ignition periods; said igniter activation means further comprising ground proving means for insuring the integrity of said ground terminal prior to each said ignition period, whereby said igniter means is not energized in the absence of a ground connection; flame sensing means for detecting the presence of flame at said outlet; and valve control means for opening said valve only during said ignition periods and periods during which flame is detected by said sensing means.
Claim 3
Dependent Claim
21 words
Apparatus according to claim 1 wherein said igniter means comprises a source of sparks for igniting fuel emanating from said outlet.
Claim 4
Dependent Claim
40 words
Apparatus according to claim 2 wherein said flame sensing means comprises means for applying an AC potential across a region directly adjacent to said outlet, and detection means for detecting the presence of current rectified by flame at said outlet.
Claim 5
Dependent Claim
41 words
Apparatus according to claim 3 including means for grounding said burner and wherein said flame sensing means comprises an electrode for applying said AC potential, and said detection means detects flame rectified current passing between said electrode and said grounded burner.
Claim 6
Dependent Claim
19 words
Apparatus according to claim 4 wherein said sparks pass between said electrode and said burner during said ignition periods.
Claim 7
Dependent Claim
37 words
Apparatus according to claim 5 wherein said igniter means comprises an isolation switch means connected between said electrode and ground, said isolation switch being open only during the passage of sparks between said electrode and said burner.
Claim 8
Dependent Claim
28 words
Apparatus according to claim 1 wherein said igniter activation means requires continuous activation of said manual means to maintain energization of said igniter means during said ignition periods.
Claim 9
Dependent Claim
37 words
Apparatus according to claim 1 wherein said valve is connected for gas communication to said inlet by a tube formed of electrically non-conductive material, and including electrical conductor means connected between said burner and said ground terminal.
Claim 10
Dependent Claim
31 words
Apparatus according to claim 1 wherein said valve control means comprises interrupter switch means for closing and maintaining closed said valve in response to an abnormal orientation of said burner apparatus.
Claim 11
Dependent Claim
40 words
Apparatus according to claim 1 including housing means retaining said power supply, said electrically operated valve, said flame sensing means, and said valve control means; and wherein said manual activation means is disposed in a side wall of said housing.
Claim 12
Dependent Claim
29 words
Apparatus according to claim 10 including a manual deactivation switch for deenergizing said valve control means to close said valve, said deactivation switch being disposed in said side wall.
Claim 13
Dependent Claim
42 words
Apparatus according to claim 1 wherein said burner comprises manual valve means for regulating the flow of gas between said inlet and outlet, and manually adjustable air supply means for regulating the air flow to the flame region adjacent to said outlet.
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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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |