US4148022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical smoke or pollutant detector
Assignee: Honeywell Inc
•
Filing: 1977-04-28
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Granted: 1979-04-03
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Expires: 1997-04-28
Abstract
Abstract A smoke or pollutant sensor has first and second conductors in non-electrical contact and a coating, between the first and second conductors, which chemically reacts with by-products of combustion to allow electrical conduction between the first and second conductors. A heating and cooling mechanism may be provided to condense the smoke onto the sensor during the cooling cycle and to aid the chemical reaction and the evaporation of any condensed water during the heating cycle. Third and fourth conductors may be provided without the coating material, and the first, second, third and fourth conductors may be connected to a detector for detecting changes in conductivity in the presence of smoke to provide an alarm function, the third and fourth conductors acting as a reference sensor to compensate for changes in humidity and atmospheric pressure.
Inventors
- 👤 Frank W. Hetznecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:07
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/117
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
102 words
A system for providing an alarm function in the presence of smoke or pollutants comprising: a sensor having first and second conductors in non-electrical contact, a coating material interspersed between and among said first and second conductors, said coating material chemically reacting with by-products of combustion or pollutants to affect conductivity between said first and second conductors; power supply means for supplying power to said first and said second conductors; detector means connected to said first and second conductors for providing an output signal upon the presence of smoke; and, alarm means responsive to said output signal for providing an alarm indication.
Claim 2
Independent Claim
102 words
A system for providing an alarm function in the presence of smoke or pollutants comprising: a sensor having first and second conductors in non-electrical contact, a coating material interspersed between and among said first and second conductors, said coating material chemically reacting with by-products of combustion or pollutants to affect conductivity between said first and second conductors; power supply means for supplying power to said first and said second conductors; detector means connected to said first and second conductors for providing an output signal upon the presence of smoke; and, alarm means responsive to said output signal for providing an alarm indication.
Claim 3
Dependent Claim
36 words
The system of claim 1 further comprising compensation means having third and fourth conductors, in non-electrical contact, connected between said power supply means and said detector means to compensate for changes in humidity and atmospheric pressure.
Claim 4
Dependent Claim
52 words
The system of claim 2 further comprising heating and cooling means in thermal contact with said first, second, third and fourth conductors for heating and cooling said sensor to condense said byproducts of combustion or pollutants onto said sensor during cooling and to evaporate, during heating, any water condensed on the sensor.
Claim 5
Dependent Claim
50 words
The system of claim 1 further comprising heating and cooling means in thermal contact with said first and second conductors for heating and cooling said sensor to condense said byproducts of combustion or pollutants onto said sensor during cooling and to evaporate, during heating, any water condensed on the sensor.
Claim 6
Dependent Claim
61 words
A sensor for chemically sensing smoke or pollutants comprising: first and second conductors in non-electrical contact, said first and second conductors adapted to be connected to a source of power; and, a coating material interspersed between and among said first and second conductors, said coating material chemically reacting with byproducts of combustion to affect conductivity between said first and second conductors.
Claim 7
Dependent Claim
61 words
A sensor for chemically sensing smoke or pollutants comprising: first and second conductors in non-electrical contact, said first and second conductors adapted to be connected to a source of power; and, a coating material interspersed between and among said first and second conductors, said coating material chemically reacting with byproducts of combustion to affect conductivity between said first and second conductors.
Claim 8
Dependent Claim
35 words
The sensor of claim 5 further comprising heating and cooling means for alternately heating and cooling said sensor, said byproducts of combustion condensing on said sensor during cooling and condensed water being evaporated during heating.
Claim 9
Dependent Claim
26 words
The sensor of claim 6 further comprising detector means connected to said first and second conductors for sensing the conductivity between said first and second conductors.
Claim 10
Dependent Claim
21 words
The sensor of claim 6 wherein said heating and cooling means comprises a thermocouple in heat transfer contact with said sensor.
Claim 11
Dependent Claim
57 words
The sensor of claim 8 further comprising compensation means having third and fourth conductors in non-electrical contact, said third conductor connected to said first conductor and said fourth conductor connected to said second conductor, said third and fourth conductors adapted to be connected to a source of power, to compensate for changes in humidity and atmospheric pressure.
Claim 12
Dependent Claim
21 words
The sensor of claim 9 further comprising heating and cooling means for alternately heating and cooling said third and fourth conductors.
Claim 13
Dependent Claim
20 words
The sensor of claim 10 wherein said heating and cooling means for said third and fourth conductors comprises thermocouple means.
Claim 14
Dependent Claim
37 words
The sensor of claim 11 further comprising detector means connected to said first, second, third and fourth conductors for responding to changes of conductivity between said first and second conductors and between said third and fourth conductors.
Claim 15
Dependent Claim
15 words
The system of claim 12 wherein said first, second, third and fourth conductors are grids.
Claim 16
Dependent Claim
57 words
The sensor of claim 5 further comprising compensation means having third and fourth conductors in non-electrical contact, said third conductor connected to said first conductor and said fourth conductor connected to said second conductor, said third and fourth conductors adapted to be connected to a source of power to compensate for changes in humidity and atmosphere pressure.
Claim 17
Dependent Claim
15 words
The sensor of claim 14 wherein said first, second, third and fourth conductors are grids.
Claim 18
Dependent Claim
49 words
The sensor of claim 14 further comprising heating and cooling means in thermal contact with said first, second, third and fourth conductors for heating and cooling said sensor to condense, during cooling, said byproducts of combustion onto said sensor and to evaporate, during heating, water condensed on the sensor.
Claim 19
Dependent Claim
15 words
The sensor of claim 16 wherein said first, second, third and fourth conductors are grids.
Claim 20
Dependent Claim
36 words
The sensor of claim 17 further comprising detector means connected to said first, second, third and fourth conductors to detect changes in conductivity between said first and second conductors and between said third and fourth conductors.
Claim 21
Dependent Claim
44 words
The sensor of claim 16 further comprising detector means connected to said first, second, third and fourth conductors for responding to any changes in conductivity between said first and second conductors and between said third and fourth conductors in response to smoke or pollutant.
Claim 22
Dependent Claim
43 words
The sensor of claim 14 further comprising detector means connected to said first, second, third and fourth conductors responsive to any changes in conductivity between said first and second conductors and between said third and fourth conductors in response to smoke or pollutant.
Claim 23
Dependent Claim
15 words
The sensor of claim 20 wherein said first, second, third and fourth conductors are grids.
Claim 24
Dependent Claim
13 words
The sensor of claim 5 wherein said first and second conductors are grids.
Claim 25
Dependent Claim
24 words
The sensor of claim 5 further comprising detector means connected to said first and second conductors for responding to any changes in conductivity therebetween.
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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |