Patent US3989048A successfully refreshed from Google Patents.
Patent US3573194A successfully refreshed from Google Patents.
US3573194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retorting of oil shale
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1969-03-26
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Granted: 1971-03-30
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Expires: 1989-03-26
Abstract
Abstract SHALE OIL OF IMPROVED QUALITY IS RECOVERED FROM OIL SHALE RETORTED IN A PLURAL STAGE RETORTING SYSTEM AT AN ELEVATED TEMPERATURE IN THE PRESENCE OF AN INERT GAS UNDER AN ELEVATED PRESSURE.
Inventors
- 👤 Jack R Hopper
- 👤 Edward L Wilson Jr
- 👤 Nick P Peet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:14
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/02; Y; Y10; Y10S; Y10S208/00; Y10S208/951
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |