US3677708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
No2 analysis and scrubber therefor
Assignee: Rosemount Inc
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Filing: 1969-12-15
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Granted: 1972-07-18
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Expires: 1989-12-15
Abstract
Abstract METHOD AND APPARTUS FOR DETERMINING NO2 IN A SAMPLE GAS STREAM CONTAINING INTERFERENTS UTILIZING A SCRUBBER AND AN ANALYTICAL INSTRUMENT WHICH IS SENSITIVE BOTH TO NO2 AND THE INTERFERENTS. THE SCRUBBER CONTAINS ARGENTIC OXIDE (AGO) WHICH EFFECTIVELY REMOVES BOTH POSITIVE AND NEGATIVE INTERENTS FROM THE SAMPLE GAS STREAM, BUT DOES NOT AFFECT THE NO2 CONTENT OF THE STREAM. THE INVENTION IS PARTICULARLY APPLICABLE TO THE MONITORING OF THE NO2 CONTENT OF POLLUTED AIR.
Inventors
- 👤 John N Harman
- 👤 Radhakrishna M Neti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:23
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/40; G01N1/405; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692; Y10T436/178459
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |