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US3755800A
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Automatic fire alarm device
Assignee: Cerberus AG
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Filing: 1972-07-10
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Granted: 1973-08-28
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Expires: 1992-07-10
Abstract
Abstract Automatic fire alarm incorporating a device for detection of combustion gases comprising a detection cell having a cathode, an anode accessible to the combustion gases and an electrolyte arranged between the anode and cathode. The anode catalytically oxidizes the carbon monoxide contained in the combustion gases while giving off electrons. An electrical circuit is coupled with the anode and the cathode for current detection and alarm indicating purposes.
Inventors
- 👤 G Purt
- 👤 P Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:29
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/4045; G08; G08B; G08B17/00; G08B17/10; G08B17/117
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
27 words
The automatic fire alarm as defined in claim 1, wherein said electrolyte possesses basic properties and said cathode is formed of material capable of delivering hydroxyl ions.
Claim 2
Dependent Claim
28 words
The automatic fire alarm as defined in claim 1, wherein the electrolyte possesses acidic properties and said cathode is formed of a material capable of taking-up hydrogen ions.
Claim 3
Dependent Claim
20 words
The automatic fire alarm as defined in claim 1, wherein the cathode possesses a polymeric phtalocyanine of a transition metal.
Claim 4
Dependent Claim
23 words
The automatic fire alarm as defined in claim 4, wherein said cathode contains carbon black coated with a phtalocyanine of the iron group.
Claim 5
Dependent Claim
23 words
The automatic fire alarm as defined in claim 1, wherein the anode contains a catalyst selected from a metal of the platinum group.
Claim 6
Dependent Claim
17 words
The automatic fire alarm as defined in claim 6, wherein the anode contains as the catalyst palladium.
Claim 7
Dependent Claim
23 words
The automatic fire alarm as defined in claim 6, wherein the anode contains nickel powder coated with a metal of the platinum group.
Claim 8
Dependent Claim
20 words
The automatic fire alarm as defined in claim 8, wherein the nickel powder is applied to a gas permeable membrane.
Claim 9
Dependent Claim
16 words
The automatic fire alarm as defined in claim 2, wherein the anode contains an ion exchanger.
Claim 10
Dependent Claim
23 words
The automatic fiRe alarm as defined in claim 10, wherein the ion exchanger comprises a copolymer of styrene divinybenzyl with quaternary ammonium groups.
Claim 11
Dependent Claim
15 words
The automatic fire alarm as defined in claim 2, wherein the electrolyte contains potassium bicarbonate.
Claim 12
Dependent Claim
15 words
The automatic fire alarm as defined in claim 2, wherein the electrolyte contains cesium carbonate.
Claim 13
Dependent Claim
15 words
The automatic fire alarm as defined in claim 3, wherein the electrolyte contains phosphoric acid.
Claim 14
Dependent Claim
25 words
The automatic fire alarm as defined in claim 1, further including a porous layer arranged between the anode and cathode and imbued with the electrolyte.
Claim 15
Dependent Claim
18 words
The automatic fire alarm as defined in claim 1, wherein the electrolyte has added thereto an evaporation-retarding substance.
Claim 16
Dependent Claim
15 words
The automatic fire alarm as defined in claim 16, wherein the evaporation-retarding substance is glycerine.
Claim 17
Dependent Claim
34 words
The automatic fire alarm as defined in claim 1, wherein said anode and cathode possesses a substantially plate-shaped configuration and are arranged at a spacing from one another which is less than 5 millimeters.
Claim 18
Dependent Claim
24 words
The automatic fire alarm as defined in claim 1, wherein both the anode and cathode are designed to be accessible to the ambient air.
Claim 19
Dependent Claim
25 words
The automatic fire alarm as defined in claim 19, wherein said cathode is formed of very finely divided silver applied to an oxygen pervious membrane.
Claim 20
Dependent Claim
30 words
The automatic fire alarm as defined in claim 1, wherein said anode possesses at the side thereof confronting the electrolyte a hydrophilic substance and at the outside a hydrophobic substance.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |