US4257039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke detector
Assignee: Individual
•
Filing: 1978-12-26
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Granted: 1981-03-17
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Expires: 1998-12-26
Abstract
Abstract A smoke detector is battery operated and may employ an ionization chamber and/or an infrared detector. When the alarm circuit is actuated due to the presence of smoke levels above a predetermined value being sensed by the detector, the alarm is actuated and each of the built in lights is illuminated. An auxilliary light energizeable by said detector is adapted to disengage one of said lights electrically and to be energized at the same time the other of said lights is energized.
Inventors
- 👤 Norman J. Webb
- 👤 David Bories
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:00
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
In a smoke detector having a housing consisting of a base and a cover, and having a smoke sensing chamber, means to activate an alarm upon the sensing of a predetermined smoke level by the sensing chamber, and an alarm, all of which are mounted in the base of said housing; said base having at least one downwardly side wall, and a bottom wall, the improvement comprising: a pair of lamp sockets, each mounted generally normal to said side wall, and disposed 180° apart from each other on said side wall, each socket having an electric light bulb therein adapted to be lit when said sockets are energized, each of said sockets being electrically connected to; a means to energize said sockets when the alarm sounds and deenergize said sockets when the alarm ceases; whereby a path of egress from the vicinity of said smoke detector is lighted when the detector detects smoke and sounds the alarm.
Claim 2
Dependent Claim
157 words
In a smoke detector having a housing consisting of a base and a cover, and having a smoke sensing chamber, means to activate an alarm upon the sensing of a predetermined smoke level by the sensing chamber, and an alarm, all of which are mounted in the base of said housing; said base having at least one downwardly side wall, and a bottom wall, the improvement comprising: a pair of lamp sockets, each mounted generally normal to said side wall, and disposed 180° apart from each other on said side wall, each socket having an electric light bulb therein adapted to be lit when said sockets are energized, each of said sockets being electrically connected to; a means to energize said sockets when the alarm sounds and deenergize said sockets when the alarm ceases; whereby a path of egress from the vicinity of said smoke detector is lighted when the detector detects smoke and sounds the alarm.
Claim 3
Dependent Claim
127 words
In the smoke detector of claim 1 further including: an auxiliary light means comprising a lamp in a socket electrically connected to a plug, said socket being wall mountable, and an electrical jack mounted on the side wall of said base proximal to a first of said pair of sockets, and electrically connected to electrically disconnect said first of said pair of lamp sockets on said base, when said auxiliary light means' plug is inserted into said jacket, said auxiliary light means being plugged into said jack; whereby upon the sounding of the alarm due to smoke detection, the second of said pair of lamps is energized and the auxiliary lamp means is energized, thereby lighting a path of egress from the vicinity of the smoke detector.
Claim 4
Dependent Claim
57 words
In the smoke detector of claim 2 wherein the auxiliary light means further includes a wall mountable base adapted to receive said electrical socket, said wall mountable base having a top surface with a circular track therein, and a lamphood rotatably secured to said base by frictional engagement of a portion of said hood with said track.
Claim 5
Dependent Claim
16 words
In the smoke detector of claim 2 wherein the smoke sensing chamber is an ionization chamber.
Claim 6
Dependent Claim
29 words
In the detector of claim 4 further including a SPDT switch connected to said battery and to a transformer connected to an AC current to alternatively power said detector.
Claim 7
Dependent Claim
18 words
In the smoke detector of claim 4 wherein said alarm and said lights are powered by separate batteries.
Claim 8
Dependent Claim
41 words
In the smoke detector of claim 6 further including a SPDT switch and a transformer connected to the battery that powers the alarm and to a transformer connected to AC current to alternatively power said alarm portion of said smoke detector.
References Cited (Backward Citations)
US3728706A
Cited
US3964036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |