Patent US3335415A successfully refreshed from Google Patents.
US2689624A
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Absorptive separation of methane and hydrogen
Assignee: Sunoco Inc
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Filing: 1951-04-26
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Granted: 1954-09-21
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Expires: 1971-04-26
Abstract
No abstract record available.
Inventors
- 👤 William H Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:52
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/52; C07; C07C; C07C7/00; C07C7/11; C01B2203/00; C01B2203/04; C01B2203/0415; C01B2203/0465; C01B2203/048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2217429A
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FR866780A
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US2325588A
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US2350256A
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US2522059A
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US2613132A
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US2608270A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |