Patent US399540A successfully refreshed from Google Patents.
US2854625A
Expired / Lapsed
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Method for determining argon
Assignee: Dow Chemical Co
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Filing: 1954-04-21
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Granted: 1958-09-30
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Expires: 1974-04-21
Abstract
No abstract record available.
Inventors
- 👤 William G Dudley
- 👤 Walter F Gerdes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:33
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/62; G01N27/68; G01N27/70
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
A METHOD FOR DETERMINING THE ARGON CONTENT OF RECYCLE AMMONIA SYNTHESIS GAS WHICH COMPRISES PASSING A STREAM OF THE AFORESAID GAS AT A CONSTANT REDUCED PRESSURE OF FROM 2 TO 100 MILLIMETERS OF MERCURY ABSOLUTE THROUGH AN ENCLOSED ZONE AND BETWEEN SPACED ELECTRODES THEREIN, MAINTAINING A CONTINUOUS ELECTRIC GLOW DISCHARGE OF CONSTANT DIRECT CURRENT BETWEEN THE ELECTRODES AT A TEMPERATURE AT WHICH THERMIONIC EMISSION IS NEGLIGIBLE, AND MEASURING THE ELECTRIC POTENTIAL ACROSS THE ELECTRODES.
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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |