Patent US3574087A successfully refreshed from Google Patents.
US3574087A
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Method and apparatus for retorting oil shales
Assignee: Mobil Oil AS
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Filing: 1968-10-01
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Granted: 1971-04-06
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Expires: 1988-10-01
Abstract
Abstract A SYSTEM FOR RETORTING OIL SHALES KNOWN AS RELATIVELY LEAN AND RELATIVELY RICH OIL SHALES IS DESCRIBED WHEREIN THE SHALES ARE MIXED TO PROVIDE AN OIL SHALE HAVING A GENERAL OR AVERAGE. FISCHER ASSAY OIL CONTENTS IN THE RANGE OF FROM ABOUT 15 TO ABOUT 36 GALLONS PER TON AND RETORTING THE MIXTURE THUS FORMED IN A GAS COMBUSTION RETORT UNDER CONDITIONS TO RECOVER HIGHER YIELDS OF OIL PRODUCTS THAN WOULD BE OBTAINED WHEN PROCESSING EACH OF THE DIFFERENT OIL SHALES SEPARATELY.
Inventors
- 👤 William S Bergen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:16
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/02
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |