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Patent US1915781A successfully refreshed from Google Patents.
US1915781A
Expired / Lapsed
US
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Process of fractionation by multiple absorption
Assignee: Standard Oil Company of California
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Filing: 1927-08-23
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Granted: 1933-06-27
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Expires: 1947-08-23
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Halloran
- 👤 Kremser Alois
- 👤 Arthur J L Hutchinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:16
CPC Classifications
C; C10; C10G; C10G5/00; C10G5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-06-26 | 1936-12-26 | 1937-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-26 | 1940-12-26 | 1941-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-26 | 1944-12-26 | 1945-06-27 | $7700.00 | Window Closed / Lapsed |