Patent US3904371A successfully refreshed from Google Patents.
US3904371A
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Chemiluminescent ammonia detection
Assignee: Rosemount Inc
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Filing: 1974-03-04
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Granted: 1975-09-09
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Expires: 1994-03-04
Abstract
Abstract Ammonia content of a gaseous mixture is determined by converting the ammonia to nitric oxide and measuring the nitric oxide. A gaseous mixture sample is passed through a heated mixture of oxides of platinum group metals and/or copper oxide together with vitreous carbon whereby any gaseous ammonia is converted catalytically into nitric oxide. Using the chemiluminescent analysis technique, the ammonia content of the gaseous mixture sample may be monitored in a suitable instrument.
Inventors
- 👤 Radhakrishna M Neti
- 👤 George S Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:45
CPC Classifications
G; G01; G01N; G01N31/00; C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/173845; Y10T436/175383
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
45 words
THE METHOD OF CONVERTING AMMONIA IN A GASEOUS MIXTURE TO NITRIC OXIDE WHICH COMPRISES THE STEPS OF: PASSING THE MIXTURE OVER A BODY OF PARTICULATE MATTER COMPRISING VITREOUS CARBON AND AN OXIDE OF A METAL SELECTED FORM THE GROUP CONSISTING OF A PLATINUM GROUP METAL,
Claim 2
Independent Claim
45 words
THE METHOD OF CONVERTING AMMONIA IN A GASEOUS MIXTURE TO NITRIC OXIDE WHICH COMPRISES THE STEPS OF: PASSING THE MIXTURE OVER A BODY OF PARTICULATE MATTER COMPRISING VITREOUS CARBON AND AN OXIDE OF A METAL SELECTED FORM THE GROUP CONSISTING OF A PLATINUM GROUP METAL,
Claim 3
Dependent Claim
48 words
The method of quantitatively determining ammonia content of a gaseous mixture which comprises the steps defined in claim 1 together with the steps of reacting the nitric oxide with ozone to produce an oxide of nitrogen with the emission of light energy and measuring the emitted light energy.
Claim 4
Dependent Claim
17 words
The method defined in claim 1 wherein the oxide is an oxide of a platinum group metal.
Claim 5
Dependent Claim
23 words
The method defined in claim 1 wherein the oxide is a mixture of copper oxide and an oxide of a platinum group metal.
Claim 6
Dependent Claim
28 words
The method defined in claim 1 wherein the particulate matter comprises vitreous carbon and copper oxide and the temperature is maintained in the range between 400* and 460*C.
Claim 7
Dependent Claim
23 words
The method defined in claim 5 wherein the particulate matter is in the form of filaments of a length of approximately 1/2 inch.
References Cited (Backward Citations)
US2167708A
Cited
US2467446A
Cited
US3027235A
Cited
US3271113A
Cited
US3652227A
Cited
US3647387A
Cited
US3659100A
Cited
US3746513A
Cited
US3730686A
Cited
US3692485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |