US3355902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helium recovery process
Assignee: Pullman Inc
•
Filing: 1964-05-11
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Granted: 1967-12-05
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Expires: 1984-05-11
Abstract
No abstract record available.
Inventors
- 👤 Duffer B Crawford
- 👤 Karafian Maxim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:52
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0233; F25J3/0204; F25J3/0209; F25J3/0257; F25J3/028; F25J3/029; F25J2220/00; F25J2220/60; F25J2220/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A METHOD FOR RECOVERING HELIUM FROM NATURAL GAS FEEDSTOCK WHICH COMPRISES: COOLING A GASEOUS MIXTURE CONTAINING HELIUM, CARBON DIOXIDE, NITROGEN, AND METHANE TO SEPARATE A FIRST LIQUID FRACTION CONTAINING DISSOLVED HELIUM AND A FIRST HELIUM ENRICHED GASEOUS FRACTION, STRIPPING HELIUM FROM SAID FIRST LIQUID FRACTION INTO AN OVERHEAD GASEOUS FRACTION, COOLING SAID OVERHEAD GASEOUS FRACTION AND SAID FIRST GASEOUS FRACTION TO SEPARATE A SECOND LIQUID FRACTION CONTAINING DISSOLVED HELIUM AND A SECOND HELIUM ENRICHED GASEOUS FRACTION, PASSING SAID SECOND LIQUID FRACTION TO A FRACTIONATION ZONE MAINTAINED UNDER CONDITIONS TO RECOVER HELIUM FROM THE SECOND LIQUID FRACTION, COOLING SAID SECOND GASEOUS FRACTION TO SEPARATE HELIUM-RICH GASEOUS MATERIAL FROM METHANE ENRICHED LIQUID UNDER CONDITIONS TO AVOID CARBON DIOXIDE PRECIPITATION, AND PASSING AT LEAST A PORTION OF SAID METHANE ENRICHED LIQUID TO SAID FRACTIONATION ZONE TO PROVIDE REFLUX THEREIN.
Claim 2
Independent Claim
136 words
A METHOD FOR RECOVERING HELIUM FROM NATURAL GAS FEEDSTOCK WHICH COMPRISES: COOLING A GASEOUS MIXTURE CONTAINING HELIUM, CARBON DIOXIDE, NITROGEN, AND METHANE TO SEPARATE A FIRST LIQUID FRACTION CONTAINING DISSOLVED HELIUM AND A FIRST HELIUM ENRICHED GASEOUS FRACTION, STRIPPING HELIUM FROM SAID FIRST LIQUID FRACTION INTO AN OVERHEAD GASEOUS FRACTION, COOLING SAID OVERHEAD GASEOUS FRACTION AND SAID FIRST GASEOUS FRACTION TO SEPARATE A SECOND LIQUID FRACTION CONTAINING DISSOLVED HELIUM AND A SECOND HELIUM ENRICHED GASEOUS FRACTION, PASSING SAID SECOND LIQUID FRACTION TO A FRACTIONATION ZONE MAINTAINED UNDER CONDITIONS TO RECOVER HELIUM FROM THE SECOND LIQUID FRACTION, COOLING SAID SECOND GASEOUS FRACTION TO SEPARATE HELIUM-RICH GASEOUS MATERIAL FROM METHANE ENRICHED LIQUID UNDER CONDITIONS TO AVOID CARBON DIOXIDE PRECIPITATION, AND PASSING AT LEAST A PORTION OF SAID METHANE ENRICHED LIQUID TO SAID FRACTIONATION ZONE TO PROVIDE REFLUX THEREIN.
References Cited (Backward Citations)
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Cited
US1204521A
Cited
US1850529A
Cited
US3205669A
Cited
US3260058A
Cited
US3282060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |