US5057436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting toxic gases
Assignee: AGMASTER Inc 4282 PILLSBURY ROAD GAINESVILLE GEORGIA 30501 A CORP OF
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Filing: 1989-10-02
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Granted: 1991-10-15
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Expires: 2009-10-02
Abstract
Abstract Apparatus for detecting the level of ammonia in air comprises a conduit through which air is flowed as an airstream past two ammonia sensors that straddle an ammonia absorber. The apparatus also comprises a signal processing circuit for comparing signals generated by the two ammonia sensors with the difference representing the level of ammonia present in the air.
Inventors
- 👤 Dean M. Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0031; G01N33/0036; G01N33/0054; G01N30/00; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/173845; Y10T436/175383
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
Apparatus for determining the level of ammonia in ambient air comprising a member having an air passage extending therethrough having an inlet and an outlet, first and second detecting means responsive to the presence of ammonia in the air for generating electric signals indicative of the amount of ammonia detected in the air, said first and second detecting means being spaced apart along said air passage with said first detecting means located adjacent said air passage inlet and said second detecting means located adjacent said air passage outlet, absorbing means for absorbing at least a portion of ammonia in the air located in said air passage between said first and second detecting means, said absorbing means comprises a non-volatile acid that reacts with ammonia, means for creating a continuous flow of air through said air passage over said non-volatile acid and said first and second detecting means, and means for evaluating any differences in the electric signals from said first and second detecting means and for producing an output signal indicative of the presence of ammonia.
Claim 2
Dependent Claim
176 words
Apparatus for determining the level of ammonia in ambient air comprising a member having an air passage extending therethrough having an inlet and an outlet, first and second detecting means responsive to the presence of ammonia in the air for generating electric signals indicative of the amount of ammonia detected in the air, said first and second detecting means being spaced apart along said air passage with said first detecting means located adjacent said air passage inlet and said second detecting means located adjacent said air passage outlet, absorbing means for absorbing at least a portion of ammonia in the air located in said air passage between said first and second detecting means, said absorbing means comprises a non-volatile acid that reacts with ammonia, means for creating a continuous flow of air through said air passage over said non-volatile acid and said first and second detecting means, and means for evaluating any differences in the electric signals from said first and second detecting means and for producing an output signal indicative of the presence of ammonia.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein each of said detector means comprises a metal oxide semiconductor.
Claim 4
Dependent Claim
20 words
The apparatus of claim 1 wherein said air flow creating means comprises means for heating each of said detector means.
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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) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |