Patent US3973192A successfully refreshed from Google Patents.
US3973192A
Expired / Lapsed
US
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Device for providing an early detection of aerosol products of combustion of a polyvinyl chloride substance
Assignee: CERBERUS Ltd CH-8708 MANNEDORF SWITZERLAND A CORP OF SWITZERLAND
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Filing: 1974-11-05
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Granted: 1976-08-03
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Expires: 1994-11-05
Abstract
Abstract A device for providing an early detection of aerosol products of combustion originating at least partly from a polyvinyl chloride substance. It comprises an electric resistance body of magnesium having a very small thickness and being arranged to be exposed to said aerosol products of combustion, an electric measuring circuit connected to the resistance body, and an indicating means arranged to generate an indicating signal in dependence on that the resistance of the resistance body exceeds a definite level.
Inventors
- 👤 Eduard Wilhelm Leonhard Justi
- 👤 Henning Ewe
- 👤 Peter Wilhelm Reinhard Brennecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:10
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G08; G08B; G08B17/00; G08B17/10; G08B17/117
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
Device for providing an early detection of aerosol products of combustion originating at least partly from a polyvinyl chloride substance, comprising an electric resistance body including a layer of magnesium dichloride arranged to be exposed to said aerosol products of combustion, an electric measuring circuit having two input electrodes connected to the resistance body and two output electrodes arranged to generate an output signal dependent on the resistance of said resistance body, and an indicating means connected to said output electrodes of the measuring circuit and arranged to generate an indicating signal when the resistance of the resistance body exceeds a predetermined level.
Claim 2
Dependent Claim
103 words
Device for providing an early detection of aerosol products of combustion originating at least partly from a polyvinyl chloride substance, comprising an electric resistance body including a layer of magnesium dichloride arranged to be exposed to said aerosol products of combustion, an electric measuring circuit having two input electrodes connected to the resistance body and two output electrodes arranged to generate an output signal dependent on the resistance of said resistance body, and an indicating means connected to said output electrodes of the measuring circuit and arranged to generate an indicating signal when the resistance of the resistance body exceeds a predetermined level.
Claim 3
Dependent Claim
24 words
Device according to claim 1 wherein said layer is in the form of a foil having a thickness in the order of 10 μm.
Claim 4
Dependent Claim
48 words
Device according to claim 2, wherein the resistance body is freely mounted inside a pipe which has an inner diameter less than 10 mm and is arranged to provide an air flow surrounding the resistance body and in which said aerosol products of combustion are expected to occur.
Claim 5
Dependent Claim
31 words
Device according to claim 3, wherein said pipe has adjacent to opposite ends of the resistance body constrictions limiting the magnitude of said air flow to 100 cm 3 per minute.
Claim 6
Dependent Claim
17 words
Device according to claim 4 wherein said constrictions consist of concavely depressed wall portions of said pipe.
References Cited (Backward Citations)
US2369499A
Cited
US3820958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |