Patent US986667A successfully refreshed from Google Patents.
Patent US4831361A successfully refreshed from Google Patents.
US4831361A
Expired / Lapsed
US
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Environmental abnormality alarm apparatus
Assignee: NITTAL COMPANY Ltd
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Filing: 1988-06-08
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Granted: 1989-05-16
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Expires: 2008-06-08
Abstract
Abstract An environmental abnormality alarm apparatus includes a sensor for detecting a fire, gas leakage, a burglar, or the like in a monitoring area, and a signal processor for receiving an output from the sensor and evaluating the output for an alarm determination reference and generating an alarm. A detecting unit is provided in the monitoring area of the sensor to detect a change in environmental condition resulting from objects or conditions other than those to be detected by the sensor, and an alarm determination reference is changed in accordance with an output state of the detecting unit during signal processing.
Inventors
- 👤 Tetsuo Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:04
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/18; G08B29/20; G08B29/24; G08B23/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
An environmental abnormality alarm apparatus comprising: sensor means for detecting a dangerous abnormality in a monitoring area; signal processor means for receiving an output from said sensor and evaluating said output against an alarm determination reference and generating an alarm based on the evaluation; detecting means in said monitoring area of said sensor means for detecting an object or condition in said monitoring area other than said dangerous abnormality to be detected by said sensor means; and means for changing said alarm determination reference in accordance with an output of said means for detecting during processing of said output of said sensor means.
Claim 2
Dependent Claim
103 words
An environmental abnormality alarm apparatus comprising: sensor means for detecting a dangerous abnormality in a monitoring area; signal processor means for receiving an output from said sensor and evaluating said output against an alarm determination reference and generating an alarm based on the evaluation; detecting means in said monitoring area of said sensor means for detecting an object or condition in said monitoring area other than said dangerous abnormality to be detected by said sensor means; and means for changing said alarm determination reference in accordance with an output of said means for detecting during processing of said output of said sensor means.
Claim 3
Independent Claim
106 words
A method for operating an environmental abnormality alarm apparatus comprising the steps of: detecting a dangerous abnormality in a monitoring area using at least one sensor, said sensor having an output; evaluating said sensor output against an alarm determination reference; generating an alarm signal based on the result of the evaluation; detecting an object or condition in said monitoring area other than said dangerous abnormality to be detected by said sensor, and generating a signal corresponding to said object or condition; and changing said alarm determination reference in accordance with said signal corresponding to said object or condition during processing of said output of said sensor.
Claim 4
Independent Claim
106 words
A method for operating an environmental abnormality alarm apparatus comprising the steps of: detecting a dangerous abnormality in a monitoring area using at least one sensor, said sensor having an output; evaluating said sensor output against an alarm determination reference; generating an alarm signal based on the result of the evaluation; detecting an object or condition in said monitoring area other than said dangerous abnormality to be detected by said sensor, and generating a signal corresponding to said object or condition; and changing said alarm determination reference in accordance with said signal corresponding to said object or condition during processing of said output of said sensor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |