US4485666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analyzer
Assignee: Coal Industry Patents Ltd
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Filing: 1982-08-18
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Granted: 1984-12-04
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Expires: 2002-08-18
Abstract
Abstract A portable gas analyzer uses a pump to take a gas sample and pump it through a carbon monoxide sensing cell, an oxygen-sensing cell and a methane-sensing pellister. Concentrations of these gases are displayed continuously on LCD displays. The gas analyzer is particularly useful in underground coal mines and offers the possibility of replacing many different gas analyzers with a simple convenient apparatus which gives continuous readings of all the critical gas concentrations.
Inventors
- 👤 John C. Higgins
- 👤 Harvie R. C. Wright
- 👤 David Trainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:15
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/0001; F24F11/30; G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0031; G01N33/0032; G01N33/0062; G01N33/0063; F24F2110/00; F24F2110/50; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A portable gas analyser capable of simultaneously determining carbon monoxide, oxygen and methane, comprising a single gas inlet, feeding means connecting with said inlet, first, second and third gas analysing means each disposed along a single gas path, for deriving a signal indicative of the concentration of one of the gases carbon monoxide, oxygen and methane, and connecting with the inlet, said first and second analysing means each comprising an electrochemical cell and said third analysing means comprising a pellistor, said feeding means comprising means for drawing a sample of gas through the inlet and feeding it successively through said first, second and third gas analysing means, and means for continuously displaying and/or transmitting and/or recording the concentrations of said gases, derived from the signal from each gas analysing means.
Claim 2
Dependent Claim
130 words
A portable gas analyser capable of simultaneously determining carbon monoxide, oxygen and methane, comprising a single gas inlet, feeding means connecting with said inlet, first, second and third gas analysing means each disposed along a single gas path, for deriving a signal indicative of the concentration of one of the gases carbon monoxide, oxygen and methane, and connecting with the inlet, said first and second analysing means each comprising an electrochemical cell and said third analysing means comprising a pellistor, said feeding means comprising means for drawing a sample of gas through the inlet and feeding it successively through said first, second and third gas analysing means, and means for continuously displaying and/or transmitting and/or recording the concentrations of said gases, derived from the signal from each gas analysing means.
Claim 3
Dependent Claim
24 words
An analyser as claimed in claim 1, comprising also a filter to remove particulates in a gas sample before contact with an analysing means.
Claim 4
Dependent Claim
17 words
An analyser as claimed in claim 1, comprising also a gas sampling probe connected to the inlet.
Claim 5
Dependent Claim
24 words
An analyser as claimed in claim 1, further comprising means for transmitting output signals for each gas concentration to an electronic mine monitoring system.
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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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |