Patent US2990690A successfully refreshed from Google Patents.
US2990690A
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Argon purification process
Assignee: Spencer Chemical Co
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Filing: 1958-10-27
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Granted: 1961-07-04
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Expires: 1978-10-27
Abstract
No abstract record available.
Inventors
- 👤 Martin Paul Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:49
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0276; F25J3/0204; F25J3/0219; F25J3/0223; F25J3/028; F25J3/0285; F25J3/04; F25J3/04248; F25J3/04333; F25J3/04351; F25J3/04521; F25J3/04527; F25J3/04539; F25J3/04563; F25J3/04587; F25J2200/00; F25J2200/90; F25J2200/94; F25J2205/00; F25J2205/30; F25J2210/00; F25J2210/42; F25J2230/00; F25J2230/42; F25J2245/00; F25J2245/42; F25J2270/00; F25J2270/90; Y; Y10; Y10S; Y10S62/00; Y10S62/915; Y10S62/923; Y10S62/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN A CORRELATED PROCESS FOR THE SYNTHESIS OF AMMONIA AND RECOVERY OF ARGON THE STEPS WHICH COMPRISE INTRODUCING ATMOSPHERIC AIR INTO AN AIR LIQUEFACTION UNIT TO PRODUCE LIQUID AIR, FRACTIONALLY DISTILLING SAID LIQUID AIR TO PROVIDE AN OXYGEN FRACTION CONTAINING THE ARGON PORTION OF SAID AIR AND A NITROGEN FRACTION CONTAINING NITROGEN AND THE REMAINING CONSTITUENTS LIGHTER THAN NITROGEN, PASSING AT LEAST A PORTION OF SAID NITROGEN FRACTION THROUGH SAID AIR LIQUEFACTION UNIT TO PRODUCE A LIQUID NITROGEN STREAM, COMBUSTIVELY REACTING THE OXYGEN FRACTION WITH SUITABLE REACTANTS TO PROVIDE A REACTION EFFLUENT CONTAINING SUBSTANTIAL PORTIONS OF HYDROGEN, CONTACTING SAID REACTION EFFLUENT WITH THE LIQUEFIED NITROGEN STREAM TO SEPARATE A FRACTION CONTAINING A MAJOR PROPORTION OF HYDROGEN AND TO PROVIDE A BOTTOM FRACTION CONTAINING THE REMAINING PORTIONS OF THE CONSTITUENTS IN SAID REACTION
Claim 2
Dependent Claim
132 words
IN A CORRELATED PROCESS FOR THE SYNTHESIS OF AMMONIA AND RECOVERY OF ARGON THE STEPS WHICH COMPRISE INTRODUCING ATMOSPHERIC AIR INTO AN AIR LIQUEFACTION UNIT TO PRODUCE LIQUID AIR, FRACTIONALLY DISTILLING SAID LIQUID AIR TO PROVIDE AN OXYGEN FRACTION CONTAINING THE ARGON PORTION OF SAID AIR AND A NITROGEN FRACTION CONTAINING NITROGEN AND THE REMAINING CONSTITUENTS LIGHTER THAN NITROGEN, PASSING AT LEAST A PORTION OF SAID NITROGEN FRACTION THROUGH SAID AIR LIQUEFACTION UNIT TO PRODUCE A LIQUID NITROGEN STREAM, COMBUSTIVELY REACTING THE OXYGEN FRACTION WITH SUITABLE REACTANTS TO PROVIDE A REACTION EFFLUENT CONTAINING SUBSTANTIAL PORTIONS OF HYDROGEN, CONTACTING SAID REACTION EFFLUENT WITH THE LIQUEFIED NITROGEN STREAM TO SEPARATE A FRACTION CONTAINING A MAJOR PROPORTION OF HYDROGEN AND TO PROVIDE A BOTTOM FRACTION CONTAINING THE REMAINING PORTIONS OF THE CONSTITUENTS IN SAID REACTION
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |