US4171944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined smoke detection and furnace shut off device
Assignee: BARRETTA MICHAEL
•
Filing: 1977-09-01
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Granted: 1979-10-23
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Expires: 1997-09-01
Abstract
Abstract A combined smoke detection and furnace shut-off device is provided having a smoke detection means which is disposable adjacent a furnace for detecting the presence of smoke unnaturally emitted from the furnace, a means for stopping ignition within the furnace, and means responsive to detection of the smoke by said smoke detection means for activating the ignition stopping means.
Inventors
- 👤 Jack B. Hirschmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:32
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/24; F23N5/245; F23N2227/00; F23N2227/28; F23N5/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A combined smoke detection and furnace shut-off device, comprising: a furnace having an ignition device and a fuel supply means: smoke detection means located in a room surrounding said furnace for detecting the presence of smoke unnaturally emitted from said furnace; means for stopping said ignition device; and means responsive to detection of smoke by said smoke detection means for activating said ignition stopping means.
Claim 2
Dependent Claim
65 words
A combined smoke detection and furnace shut-off device, comprising: a furnace having an ignition device and a fuel supply means: smoke detection means located in a room surrounding said furnace for detecting the presence of smoke unnaturally emitted from said furnace; means for stopping said ignition device; and means responsive to detection of smoke by said smoke detection means for activating said ignition stopping means.
Claim 3
Dependent Claim
39 words
A device as defined in claim 1 wherein said smoke detection means includes ionization detection means for producing an output indicative of sensed smoke, said ionization detection means activating said responsive means at a predetermined level of sensed smoke.
Claim 4
Dependent Claim
28 words
A device as defined in claim 2 including fuel supply shut-off means for stopping the supply of fuel to the furnace in response to said smoke detection means.
Claim 5
Dependent Claim
48 words
A device as defined in claim 3 wherein said responsive means is an electric circuit means for receiving a signal from said ionization detection means upon reaching said predetermined level of sensed smoke and supplying a signal to said ignition stopping means so as to activate the same.
Claim 6
Dependent Claim
41 words
A device as defined in claim 1 wherein said smoke detection means includes optical smoke detection means for producing an output indicative of sensed smoke, said optical smoke detection means activating said responsive means at a predetermined level of sensed smoke.
Claim 7
Dependent Claim
27 words
A device as defined in claim 6 including fuel supply shut-off means for stopping the supply of fuel to the furnace responsive to said smoke detection means.
Claim 8
Dependent Claim
49 words
A device as defined in claim 7 wherein said responsive means is an electric circuit means for receiving a signal from said optical smoke detection means upon reaching said predetermined level of sensed smoke and supplying a signal to said ignition stopping means so as to activate the same.
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) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |