US4803469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire alarm system
Assignee: Hochiki Corp
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Filing: 1986-07-14
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Granted: 1989-02-07
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Expires: 2006-07-14
Abstract
Abstract A fire alarm system which comprises one or more detecting sections for detecting a change in the surrounding phenomena due to a fire in an analog form; a storing section for storing the analog data output from the detecting section or sections; a level comparing section for comparing a data level represented by present instantaneous analog data output from the detecting section or sections and a predetermined level; fire judging instructing section which extracts a plurality of data stored during a predetermined period of time back to from the time when a comparison signal is obtained from the level comparing section, calculates a change amount between the respective extracted data and generates an output for initiating the calculation when the number of the calculated change amounts exceeding a predetermined amount exceeds a predetermined number; and a fire judging section for receiving the data stored in the storing section in response to the signal from the comparing section and/or fire judging instructing section to judge a fire.
Inventors
- 👤 Eiji Matsushita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:51
CPC Classifications
G; G08; G08B; G08B17/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
211 words
A fire alarm system which comprises: one or more detecting sections for detecting a change in the surrounding phenomena due to a fire and outputting data in an analog mode; a data processing section receiving said outputted analog data from the detecting section or sections at intervals and smoothing said analog data by interrelating analog data from a plurality of said intervals; a storing section for storing the smoothed data output from the data processing section; a level comparing section for comparing a data level represented by present smoothed data output from the detecting section or sections with a preset level and producing a comparison signal when such level is exceeded; a fire judging instructing section which extracts a plurality of data stored during a predetermined period of time preceding the time when a comparison signal is obtained from the level comparing section, calculates a change amount between the respective extracted data, determines the number of data for which such change amounts exceed a predetermined value, and generates a signal for instructing the start of a fire judgment calculation when the number of such data exceeds a predetermined number; and a fire judging section for making a fire judgment calculation in response to the signal from the fire judging instructing section.
Claim 2
Dependent Claim
211 words
A fire alarm system which comprises: one or more detecting sections for detecting a change in the surrounding phenomena due to a fire and outputting data in an analog mode; a data processing section receiving said outputted analog data from the detecting section or sections at intervals and smoothing said analog data by interrelating analog data from a plurality of said intervals; a storing section for storing the smoothed data output from the data processing section; a level comparing section for comparing a data level represented by present smoothed data output from the detecting section or sections with a preset level and producing a comparison signal when such level is exceeded; a fire judging instructing section which extracts a plurality of data stored during a predetermined period of time preceding the time when a comparison signal is obtained from the level comparing section, calculates a change amount between the respective extracted data, determines the number of data for which such change amounts exceed a predetermined value, and generates a signal for instructing the start of a fire judgment calculation when the number of such data exceeds a predetermined number; and a fire judging section for making a fire judgment calculation in response to the signal from the fire judging instructing section.
Claim 3
Dependent Claim
40 words
A fire alarm system according to claim 1, in which said fire judging section carries out a predictive calculation of fire from the data stored in the storing section in response to the signal from the fire judging instructing section.
Claim 4
Dependent Claim
44 words
A fire alarm system according to claim 1, wherein said data processing section for processing the analog data which is provided by said detecting section calculates moving averages of a predetermined number of such data and output the moving averages to the storing section.
Claim 5
Dependent Claim
24 words
A fire alarm system according to claim 1, wherein said change amount is calculated in terms of the differences between the respective stored data.
Claim 6
Dependent Claim
17 words
A fire alarm system according to claim 4, wherein said respective stored data are consecutive in time.
Claim 7
Dependent Claim
19 words
A fire alarm system according to claim 4, wherein said respective stored data are every other data in time.
Claim 8
Dependent Claim
39 words
A fire alarm system according to claim 3, wherein said change amount is calculated in terms of the quotient of the difference between the respective stored data and the difference between the detection times of the respective stored data.
Claim 9
Dependent Claim
17 words
A fire alarm system according to claim 7, wherein said respective stored data are consecutive in time.
Claim 10
Dependent Claim
19 words
A fire alarm system according to claim 7, wherein said respective stored data are every other data in time.
Claim 11
Dependent Claim
184 words
A fire alarm system which comprises: one or more detecting sections for detecting a change in the surrounding phenomena due to a fire and outputting data in an analog mode; a data processing section receiving said outputted analog data from the detecting section or sections at intervals and smoothing said analog data by interrelating analog data from a plurality of said intervals; a storing section for storing the smoothed data output from the data processing section; a level comparing section for comparing a data level represented by present data output from the processing section with a preset level and producing a comparison signal when such level is exceeded; a fire judging instructing section which extracts a plurality of data stored and calculates a change amount between the respective extracted data and generates an output for instructing the start of a fire judgement when the number of the calculated change amounts exceeding a predetermined amount exceeds a predetermined number; and a fire judging section for judging the fire in response to the comparison signal from the level comparing section and the fire judging instructing section.
Claim 12
Dependent Claim
184 words
A fire alarm system which comprises: one or more detecting sections for detecting a change in the surrounding phenomena due to a fire and outputting data in an analog mode; a data processing section receiving said outputted analog data from the detecting section or sections at intervals and smoothing said analog data by interrelating analog data from a plurality of said intervals; a storing section for storing the smoothed data output from the data processing section; a level comparing section for comparing a data level represented by present data output from the processing section with a preset level and producing a comparison signal when such level is exceeded; a fire judging instructing section which extracts a plurality of data stored and calculates a change amount between the respective extracted data and generates an output for instructing the start of a fire judgement when the number of the calculated change amounts exceeding a predetermined amount exceeds a predetermined number; and a fire judging section for judging the fire in response to the comparison signal from the level comparing section and the fire judging instructing section.
Claim 13
Dependent Claim
50 words
A fire alarm system according to claim 10, in which said fire judging section carries out a predictive calculation of fire upon receiving the output signal from the level comparing section and the data stored in the storing section in response to the signal from the fire judging instructing section.
Claim 14
Dependent Claim
54 words
A fire alarm system according to claim 11, wherein said data processing section for processing the analog data and which is provided between said detecting section and the storing section, calculates moving averages of the data whenever a predetermined number of analog data are input and outputs the moving averages to the storing section.
Claim 15
Dependent Claim
24 words
A fire alarm system according to of claim 12, wherein said change amount is calculated in terms of difference between the respective stored data.
Claim 16
Dependent Claim
17 words
A fire alarm system according to claim 13, wherein said respective stored data are consecutive in time.
Claim 17
Dependent Claim
19 words
A fire alarm system according to claim 13, wherein said respective stored data are every other data in time.
Claim 18
Dependent Claim
38 words
A fire alarm system according to claim 12, wherein said change amount is calculated in terms of quotient divided by a difference between the respective stored data and a difference between detection times of the respective stored data.
Claim 19
Dependent Claim
17 words
A fire alarm system according to claim 16, wherein said respective stored data are consecutive in time.
Claim 20
Dependent Claim
19 words
A fire alarm system according to claim 16, wherein said respective stored data are every other data in time.
References Cited (Backward Citations)
US4151522A
Cited
US4459583A
Cited
US4517554A
Cited
US4514720A
Cited
US4644331A
Cited
US4665390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |