US5260691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire alarm device accompanied with air conditioner
Assignee: North Pacific Automation Corp
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Filing: 1990-10-30
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Granted: 1993-11-09
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Expires: 2010-10-30
Abstract
Abstract A combination fire alarm/air conditioner, which can immediately detect a fire. The device includes a temperature-sensor and/or a smoke-sensor installed in the room-side air inlet of the air conditioner. Signals generated by the sensor are received by a microcomputer which monitors them based on a threshold and a rate of change of the signals. When the rate of change of the signals exceeds the threshold, the microcomputer produces signals which set off an alarm.
Inventors
- 👤 Jia-Ming Shyu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:43
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/117; G08B17/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A combination fire alarm/air circulating system for a room, comprising: means for circulating air in the room, said circulating means having an air inlet and means for drawing the room air into said air inlet; sensing means, located in said air inlet for sensing at least one of temperature and smoke values of the room air drawn into said air inlet by said drawing means; and a microcomputer for monitoring the values sensed by said sensing means, calculating a rate of change of said values, comparing the calculated rate of change to a preset threshold and generating a warning signal if the calculated rate of change exceeds the preset threshold.
Claim 2
Dependent Claim
110 words
A combination fire alarm/air circulating system for a room, comprising: means for circulating air in the room, said circulating means having an air inlet and means for drawing the room air into said air inlet; sensing means, located in said air inlet for sensing at least one of temperature and smoke values of the room air drawn into said air inlet by said drawing means; and a microcomputer for monitoring the values sensed by said sensing means, calculating a rate of change of said values, comparing the calculated rate of change to a preset threshold and generating a warning signal if the calculated rate of change exceeds the preset threshold.
Claim 3
Dependent Claim
25 words
A system of according to claim 1, further comprising a backup power supply to supply power for said system during a period of power failure.
Claim 4
Dependent Claim
17 words
A system according to claim 1, where said means for circulating air is a window air conditioner.
Claim 5
Dependent Claim
18 words
A system according to claim 1, wherein the means for circulating air is a central air conditioning system.
Claim 6
Dependent Claim
23 words
A system according to claim 1, further comprising an alarm means, responsive to said warning signal, for providing a warning of a fire.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |