US3239996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating helium from other constituents of natural gas
Assignee: Exxon Mobil Corp
•
Filing: 1963-03-18
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Granted: 1966-03-15
•
Expires: 1983-03-18
Abstract
No abstract record available.
Inventors
- 👤 Donald R Huffman
- 👤 Robin J Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:46
CPC Classifications
C; C01; C01B; C01B23/00; B; B01; B01D; B01D53/00; B01D53/22; C07; C07C; C07C7/00; C07C7/144
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A METHOD OF SEPARATING HELIUM FROM A GAS MIXTURE COMPRISING MAJOR AMOUNTS OF METHANE WITH MINOR AMOUNTS OF HELIUM AND HIGHER HYDROCARBONS THAN METHANE COMPRISING: IRRADIATING A THIN MEMBRANE OF FLUORINATED POLYOLEFIN FILM, CONTACTING THE IRRADIATED FILM WITH SAID GAS MIXTURE UNDER PRESSURE TO CAUSE A PORTION OF SAID GAS
Claim 2
Independent Claim
50 words
A METHOD OF SEPARATING HELIUM FROM A GAS MIXTURE COMPRISING MAJOR AMOUNTS OF METHANE WITH MINOR AMOUNTS OF HELIUM AND HIGHER HYDROCARBONS THAN METHANE COMPRISING: IRRADIATING A THIN MEMBRANE OF FLUORINATED POLYOLEFIN FILM, CONTACTING THE IRRADIATED FILM WITH SAID GAS MIXTURE UNDER PRESSURE TO CAUSE A PORTION OF SAID GAS
References Cited (Backward Citations)
US2540152A
Cited
US2981680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |