US4384488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke detector
Assignee: Cerberus AG
•
Filing: 1981-04-27
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Granted: 1983-05-24
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Expires: 2001-04-27
Abstract
Abstract A smoke detector containing at least one smoke measuring chamber which possesses a mounting or socket plate having an upper surface intended to be mounted at the ceiling of a room or other appropriate area to be monitored and a housing enclosing the smoke measuring chamber and suspendingly secured at the socket plate. The housing possesses openings for the entry of the ambient air into the smoke measuring chamber. The smoke detector comprises a manually adjustable device by means of which it is possible to change the air entry openings in a manner such that the smoke detector can be accommodated to different environmental or ambient conditions, especially those containing different quantities of dust and other contaminants.
Inventors
- 👤 Andreas Scheidweiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:56
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
A smoke detector comprising: a housing enclosing at least one smoke measuring chamber; said housing being provided with openings for the entry of ambient air into the smoke measuring chamber; and manually adjustable means for changing the air entry openings in order to accommodate the smoke detector to different ambient atmospheric conditions.
Claim 2
Dependent Claim
52 words
A smoke detector comprising: a housing enclosing at least one smoke measuring chamber; said housing being provided with openings for the entry of ambient air into the smoke measuring chamber; and manually adjustable means for changing the air entry openings in order to accommodate the smoke detector to different ambient atmospheric conditions.
Claim 3
Dependent Claim
43 words
The smoke detector as defined in claim 1, wherein: said manually adjustable means is structured for changing the cross-sectional area of the air entry openings of the smoke detector to accommodate the smoke detector to the degree of contamination of the surrounding atmosphere.
Claim 4
Dependent Claim
37 words
The smoke detector as defined in claim 1, wherein: said air entry openings define inner and outer air entry openings; and said manually adjustable means serves to change the outer air entry openings of the smoke detector.
Claim 5
Dependent Claim
37 words
The smoke detector as defined in claim 1, wherein: said air entry means define inner and outer air entry openings; and said manually adjustable means serves to change the inner air entry openings of the smoke detector.
Claim 6
Dependent Claim
34 words
The smoke detector as defined in claim 1, wherein: said air entry openings define inner and outer air entry openings; and said manually adjustable means simultaneously changes the inner and outer air entry openings.
Claim 7
Dependent Claim
25 words
The smoke detector as defined in claim 1, wherein: said manually adjustable means contains structure for accomplishing a stepwise change of the air entry openings.
Claim 8
Dependent Claim
23 words
The smoke detector as defined in claim 1, further including: marking means for enabling discerning of the position of the manually adjustable means.
Claim 9
Dependent Claim
28 words
The smoke detector as defined in claim 1, wherein: said manually adjustable means is structured such that it can be only adjusted from externally of the smoke detector.
Claim 10
Dependent Claim
29 words
The smoke detector as defined in claim 1, wherein: said manually adjustable means is structured such that it only can be adjusted from the inside of the smoke detector.
References Cited (Backward Citations)
US3495521A
Cited
CH551057A
Cited
US3908957A
Cited
US3903419A
Cited
US4220862A
Cited
FR2430612A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |