Patent DE890340C successfully refreshed from Google Patents.
Patent US3333435A successfully refreshed from Google Patents.
US3333435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for handling off-specification helium
Assignee: Phillips Petroleum Co
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Filing: 1964-08-28
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Granted: 1967-08-01
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Expires: 1984-08-28
Abstract
No abstract record available.
Inventors
- 👤 Horace M Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:18
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0204; F25J3/0209; F25J3/0228; F25J3/0233; F25J3/0238; F25J3/0257; F25J3/028; F25J3/029; F25J2210/00; F25J2210/04; F25J2245/00; F25J2245/02; F25J2280/00; F25J2280/10; F25J2290/00; F25J2290/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR RECOVERING HELIUM FROM NATURAL GAS CONTAINING HELIUM COMPRISING THE STEPS OF: (A) PASSING A FIRST STREAM OF SAID GAS TO A FIRST HELIUM SEPARATION PLANT AND RECOVERING A HELIUM-RICH STREAM THEREFROM IN WHICH THE CONCENTRATION OF HELIUM IS OF SPECIFICATION GRADE; (B) PASSING A SECOND STREAM OF SAID GAS TO A SECOND HELIUM SEPARATION PLANT DURING START-UP AFTER A SHUTDOWN TO RECOVER A SECOND HELIUM-RICH GAS STREAM HAVING A HELIUM CONCENTRATION BELOW SPECIFICATION GRADE; (C) PASSING THE HELIUM-RICH GAS STREAM OF STEP (B) TO THE FIRST PLANT OF STEP (A) IN ADMIXTURE WITH SAID FIRST STREAM UNTIL THE SECOND HELIUM-RICH GAS STREAM OF STEP (B) REACHES SPECIFICATION GRADE; AND
Claim 2
Dependent Claim
112 words
A PROCESS FOR RECOVERING HELIUM FROM NATURAL GAS CONTAINING HELIUM COMPRISING THE STEPS OF: (A) PASSING A FIRST STREAM OF SAID GAS TO A FIRST HELIUM SEPARATION PLANT AND RECOVERING A HELIUM-RICH STREAM THEREFROM IN WHICH THE CONCENTRATION OF HELIUM IS OF SPECIFICATION GRADE; (B) PASSING A SECOND STREAM OF SAID GAS TO A SECOND HELIUM SEPARATION PLANT DURING START-UP AFTER A SHUTDOWN TO RECOVER A SECOND HELIUM-RICH GAS STREAM HAVING A HELIUM CONCENTRATION BELOW SPECIFICATION GRADE; (C) PASSING THE HELIUM-RICH GAS STREAM OF STEP (B) TO THE FIRST PLANT OF STEP (A) IN ADMIXTURE WITH SAID FIRST STREAM UNTIL THE SECOND HELIUM-RICH GAS STREAM OF STEP (B) REACHES SPECIFICATION GRADE; AND
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) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |