Patent US3669930A successfully refreshed from Google Patents.
US3062016A
Expired / Lapsed
US
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Maintaining high purity argon atmosphere
Assignee: Airco Inc
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Filing: 1957-12-31
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Granted: 1962-11-06
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Expires: 1977-12-31
Abstract
No abstract record available.
Inventors
- 👤 Dennis Wolcott
- 👤 Donald L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:10
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/044; F25J3/0228; F25J3/028; F25J3/0285; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04296; F25J3/04521; F25J3/04563; F25J3/04763; F25J3/04769; F25J3/04812; F25J3/08; F25J2200/00; F25J2200/08; F25J2200/32; F25J2200/50; F25J2200/72; F25J2205/00; F25J2205/24; F25J2205/60; F25J2205/82; F25J2210/00; F25J2210/04; F25J2210/42; F25J2215/00; F25J2215/58; F25J2245/00; F25J2245/42; F25J2245/90; F25J2260/00; F25J2260/42; F25J2260/44; F25J2260/58; F25J2270/00; F25J2270/42; F25J2270/90; F25J2270/904; F25J2290/00; F25J2290/62; Y; Y10; Y10S; Y10S62/00; Y10S62/923; Y10S62/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN AN ARGON PURIFICATION PROCESS FOR PURIFYING AN ARGON GAS SUBSTANTIALLY FREE OF AXYGEN AND CONTAINING HYDROGEN, NITROGEN AND HYDROCARBONS AS IMPURITIES, THE STEPS COMPRISING PARTIALLY LIQUEFYING A FEED STEAM OF THE IMPURE ARGON TO SEPARATE A SUBSTANTIALLY HYDROGENFREE LIQUID FRACTION AND A GASEOUS FRACTION CONTAINING SUBSTANTIALLY ALL OF THE HYDROGEN, RECTIFYING THE LIQUID FRACTION IN A FRIST COLUMN, OBTAINING THEREFROM A LIQUID FRACTION SUBSTANTIALLY FREE OF NITROGEN AND A GASEOUS FRACTION CONTAINING SUBSTANTIALLY ALL OF THE NITROGEN CONTENT
Claim 2
Dependent Claim
79 words
IN AN ARGON PURIFICATION PROCESS FOR PURIFYING AN ARGON GAS SUBSTANTIALLY FREE OF AXYGEN AND CONTAINING HYDROGEN, NITROGEN AND HYDROCARBONS AS IMPURITIES, THE STEPS COMPRISING PARTIALLY LIQUEFYING A FEED STEAM OF THE IMPURE ARGON TO SEPARATE A SUBSTANTIALLY HYDROGENFREE LIQUID FRACTION AND A GASEOUS FRACTION CONTAINING SUBSTANTIALLY ALL OF THE HYDROGEN, RECTIFYING THE LIQUID FRACTION IN A FRIST COLUMN, OBTAINING THEREFROM A LIQUID FRACTION SUBSTANTIALLY FREE OF NITROGEN AND A GASEOUS FRACTION CONTAINING SUBSTANTIALLY ALL OF THE NITROGEN CONTENT
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |