US3970387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nondispersion, two beam, infrared gas analyzer
Assignee: ABB Training Center GmbH and Co KG
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Filing: 1975-02-05
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Granted: 1976-07-20
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Expires: 1995-02-05
Abstract
Abstract The two beam analyzer has chambers traversed by infrared beams and passed through by test gas; the intensity of each beam is detected by a detector having chambers which are filled with gas of the same type as the gas to be detected (as a trace) in the test gas. Additionally, one beam path includes a selectivity cuvette or cell, filled exclusively with that type of gas, but at a rather low pressure.
Inventors
- 👤 Reimar Faulhaber
- 👤 Margareta Ascherfeld
- 👤 Walter Fabinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:37
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/37
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
In a non-dispersion, two infrared beam gas analyzer having first and second beam paths extending respectively between means for providing two beams of infrared radiation and a two-input detector, each beam path including a cell with test gas which includes a carrier gas and, possibly, traces of a gas to be detected, the improvement of a selectivity cell in one of the beam paths containing no carrier gas but exclusively gas of the same type as the gas to be detected and at a pressure below the pressure of the test gas.
Claim 2
Dependent Claim
92 words
In a non-dispersion, two infrared beam gas analyzer having first and second beam paths extending respectively between means for providing two beams of infrared radiation and a two-input detector, each beam path including a cell with test gas which includes a carrier gas and, possibly, traces of a gas to be detected, the improvement of a selectivity cell in one of the beam paths containing no carrier gas but exclusively gas of the same type as the gas to be detected and at a pressure below the pressure of the test gas.
Claim 3
Dependent Claim
19 words
In an analyzer as in claim 1 wherein said pressure is about 20 millibars but well below atmospheric pressure.
Claim 4
Dependent Claim
14 words
In an analyzer as in claim 1 wherein said pressure is about 200 millibars.
Claim 5
Dependent Claim
33 words
In an analyzer as in claim 1 and including a cell in the respective other beam containing gas which is neutral as regards absorbtion of infrared radiation by the gas to be detected.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |