Patent US3135591A successfully refreshed from Google Patents.
US3135591A
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Separation of helium from a gaseous mixture by means of a novel selective diffusion barrier
Assignee: Standard Oil Co
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Filing: 1960-09-08
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Granted: 1964-06-02
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Expires: 1980-09-08
Abstract
No abstract record available.
Inventors
- 👤 Jones Arthur Letcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:46
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22; B01D63/00; B01D63/06; B01D2313/00; B01D2313/22; B01D2319/00; B01D2319/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
A METHOD FOR SEPARATING HELIUM FROM A GASEOUS MIXTURE CONTAINING THE SAME COMPRISING BRINGING SAID GASEOUS MIXTURE INTO CONTACT WITH ONE SIDE OF A SELECTIVE DIFFUSION BARRIER CONSISTING ESSENTIALLY OF A POROUS GLASS SUBSTRATUM ON WHICH IS DEPOSITED A VERY THIN LAYER OF SUBSTANTIALY PURE SILICA HAVING AN AVERAGE THICKNESS OF APPROXIMATELY 1X10**-7 COM. TO 5X10**-7 CM. WHEREBY THE HELIUM PERMEATES THROUGH SAID SELECTIVE DIFFUSION BARRIER, AND REMOVING THE PERMEATED HELIUM FROM THE OPPOSITE SIDE OF SAID SELECTIVE DIFFUSION BARRIER.
References Cited (Backward Citations)
US2106744A
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US2479540A
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US2617153A
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US2707899A
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US3019853A
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US2961062A
Cited
US3022858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |