US2882973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of oil from tar sands
Assignee: Shell Development Co
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Filing: 1957-06-17
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Granted: 1959-04-21
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Expires: 1977-06-17
Abstract
No abstract record available.
Inventors
- 👤 Todd M Doscher
- 👤 Reisberg Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:25
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
THE PROCESS OF RECOVERING OIL FROM OIL-CONTAINING TAR SANDS WHICH COMPRISES CONTACTING TAR SANDS IN THE FORMATION WITH AN AQUEOUS SOLUTION HAVING A PH OF AT LEAST 12 AND CONTAINING A NON-IONIC SURFACTANT, THEREBY EXTRACTING THE OIL FROM THE TAR SANDS BY SPONTANEOUS EMULSIFICATION THEREOF IN THE AQUEOUS SOLUTION, RECOVERING THE EMULSION THUS FORMED FROM THE FORMATON, AND SEPARTING THE OIL FROM SAID EMULSION.
Claim 2
Dependent Claim
64 words
THE PROCESS OF RECOVERING OIL FROM OIL-CONTAINING TAR SANDS WHICH COMPRISES CONTACTING TAR SANDS IN THE FORMATION WITH AN AQUEOUS SOLUTION HAVING A PH OF AT LEAST 12 AND CONTAINING A NON-IONIC SURFACTANT, THEREBY EXTRACTING THE OIL FROM THE TAR SANDS BY SPONTANEOUS EMULSIFICATION THEREOF IN THE AQUEOUS SOLUTION, RECOVERING THE EMULSION THUS FORMED FROM THE FORMATON, AND SEPARTING THE OIL FROM SAID EMULSION.
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) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |