US3681603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke detector with at least one smoke measuring chamber
Assignee: Cerberus AG
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Filing: 1970-05-18
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Granted: 1972-08-01
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Expires: 1990-05-18
Abstract
Abstract A device for the detection of smoke or combustion aerosols comprising a supporting member for attachment to the ceiling of a room and a housing dependent therefrom enclosing a detection chamber. This housing is provided with openings for the entry of the ambient or surrounding atmosphere into the confines of the smoke detection chamber. These openings are arranged in two different zones, wherein the opening or openings in an upper zone are spaced at a maximum of 20 mm. from the room ceiling upon which the device is to be mounted and the opening or openings in the lower zone are arranged at the underside or bottom of such housing.
Inventors
- 👤 Andreas Scheidweiler
- 👤 Peter Muller
- 👤 Max Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:12
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113; G08B17/103; G08B17/107; H; H10; H10W; H10W72/00; H10W72/071; H10W72/072; H10W72/07231; H10W72/07236
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
118 words
A device for the detection of smoke or combustion aerosols comprising a supporting member arranged for attachment to the ceiling of a room, a housing dependent from said supporting member and enclosing a detection ionization chamber, said chamber containing ionization means, said housing being provided with aperture means arranged in two separate zones defining an upper zone and a lower zone, said upper and lower zones being separated by a continuous impermeable zone, said aperture means of said upper zone being spaced substantially entirely not more than 20 millimeters from the room ceiling upon which the detection device is to be mounted and saiD aperture means of said lower zone being arranged at the bottom of said housing.
Claim 2
Independent Claim
118 words
A device for the detection of smoke or combustion aerosols comprising a supporting member arranged for attachment to the ceiling of a room, a housing dependent from said supporting member and enclosing a detection ionization chamber, said chamber containing ionization means, said housing being provided with aperture means arranged in two separate zones defining an upper zone and a lower zone, said upper and lower zones being separated by a continuous impermeable zone, said aperture means of said upper zone being spaced substantially entirely not more than 20 millimeters from the room ceiling upon which the detection device is to be mounted and saiD aperture means of said lower zone being arranged at the bottom of said housing.
Claim 3
Dependent Claim
19 words
The device defined in claim 1, wherein said aperture means of said upper zone comprises at least one aperture.
Claim 4
Dependent Claim
20 words
The device as defined in claim 1, wherein said aperture means of said lower zone comprises at least one aperture.
Claim 5
Dependent Claim
35 words
The device defined in claim 1, wherein said detection ionization chamber is responsive to smoke or combustion aerosols passing through said aperture means, said ionization chamber being connected electrically in series with a resistance element.
Claim 6
Dependent Claim
15 words
The device defined in claim 4, wherein said resistance element is a reference ionization chamber.
Claim 7
Dependent Claim
38 words
The device defined in claim 4, wherein the space within the detection device occupied by said electrical circuit means is situated centrally in the detection device and does not extend downwards more than 30 millimeters from the ceiling.
Claim 8
Dependent Claim
29 words
The device defined in claim 1, wherein said aperture means of the upper zone are constituted by a substantially continuous annular aperture having a width not exceeding 8 millimeters.
Claim 9
Dependent Claim
23 words
The device defined in claim 7 wherein said annular aperture is separated from said supporting member by a distance not exceeding 10 millimeters.
Claim 10
Dependent Claim
28 words
The device defined in claim 1, wherein said aperture means of the upper zone are constituted by substantially annular aperture means having a width not exceeding 8 millimeters.
Claim 11
Dependent Claim
29 words
The device defined in claim 1, wherein said aperture means of said lower zone are constituted by a substantially continuous annular slit having a width not exceeding 5 millimeters.
Claim 12
Dependent Claim
26 words
The device defined in claim 1, wherein said aperture means of said lower zone are constituted by slit means having a width not exceeding 8 millimeters.
Claim 13
Dependent Claim
12 words
The device defined in claim 1, wherein said housing is substantially cylindrical.
Claim 14
Dependent Claim
31 words
The device defined in claim 1, wherein said housing possesses the form of a truncated cone, the generatrices of which are inclined to the vertical at an angle not exceeding 10*.
Claim 15
Dependent Claim
14 words
The device defined in claim 1, wherein the bottom of said housing is flat.
Claim 16
Dependent Claim
33 words
The device defined in claim 1, wherein the bottom of said housing possesses the form of a cone, the generatrices of which are inclined to the horizontal at an angle not exceeding 10*.
Claim 17
Dependent Claim
42 words
The device as defined in claim 4, wherein said detection chamber is equipped with an upper electrode and a lower electrode, said housing being devoid of said aperture means in the region thereof spanning between said upper electrode and said lower electrode.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |