US3607076A
Expired / Lapsed
US
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Procedure and apparatus for determination of water in nitrogen tetroxide
Assignee: National Aeronautics and Space Administration
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Filing: 1969-02-18
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Granted: 1971-09-21
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Expires: 1989-02-18
Abstract
Abstract Nitrogen tetroxide is analyzed for water content by passing it through hot copper contained in a column wherein all nitrogen and hydrogen containing compounds are converted quantitatively to nitrogen and water. The resultant material from the column is then passed into a gas chromatograph whereupon the amount of water initially contained in the nitrogen tetroxide can be determined.
Inventors
- 👤 Raffaele F Muraca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:58
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
48 words
The method of claim 1 additionally comprising: directing a stream of inert gas carrier over said copper and into said chromatograph, and depositing said sample in said gas prior to said gas contacting copper whereby said gas can carry said sample over said copper and into said chromatograph.
Claim 2
Dependent Claim
21 words
The method of claim 1 comprising: controlling the amount of said sample passed over said copper and directed to said chromatograph.
Claim 3
Dependent Claim
44 words
The method of claim 3 wherein said amount of sample is controlled by: directing the nitrogen tetroxide to be analyzed to a valve for regulating the amount to pass to said copper, and maintaining said valve at a temperature between 0* and 2* C.
Claim 4
Dependent Claim
32 words
The method of claim 4 comprising: disposing said copper in a column whereby said sample can pass through said valve, and heating said column to a temperature between 300* and 900* C.
Claim 5
Dependent Claim
13 words
The method of claim 5 comprising: heating said column to about 800* C.
Claim 6
Dependent Claim
103 words
The method of claim 5 additionally comprising: maintaining the residency of said sample in said column for a time period sufficient to achieve a complete reduction of the sample. 0* and 2* C. This fluctuation is in the accuracy limits of the entire analysis and the volumetric accuracy of the valve itself. The particular sample valve 33 utilized a sample of two microliters. Due to this small amount of sample, it can be readily seen that the nitrogen tetroxide is rapidly brought to the equilibrium temperature of 0*-2* C. Thus there is no need for controlling the temperature of the sample vessel 27.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |