US2895884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shale retorting apparatus and process
Assignee: Union Oil Company of California
•
Filing: 1956-03-22
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Granted: 1959-07-21
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Expires: 1976-03-22
Abstract
No abstract record available.
Inventors
- 👤 Robert L Switzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:37
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
IN A METHOD FOR CONTACTING FLUIDS WITH FINES-CONTAINING SOLIDS, WHICH COMPRISES PASSING SAID SOLIDS UPWARDLY SUCCESSIVELY THROUGH A FORAMINATE DISENGAGING ZONE AND A CONTACTING ZONE AND PASSING A FLUID COMPRISING A LIQUID AND GASEOUS PHASE DOWNWARDLY IN COUNTERCURRENT CONTACT WITH SAID SOLIDS SUCCESSIVELY THROUGH SAID CONTACTING ZONE AND SAIDD DISENGAGING ZONE, THE IMPROVEMENT WHICH COMPRISES ESTABLISHING AA SLOPING MANIFOLD
Claim 2
Dependent Claim
59 words
IN A METHOD FOR CONTACTING FLUIDS WITH FINES-CONTAINING SOLIDS, WHICH COMPRISES PASSING SAID SOLIDS UPWARDLY SUCCESSIVELY THROUGH A FORAMINATE DISENGAGING ZONE AND A CONTACTING ZONE AND PASSING A FLUID COMPRISING A LIQUID AND GASEOUS PHASE DOWNWARDLY IN COUNTERCURRENT CONTACT WITH SAID SOLIDS SUCCESSIVELY THROUGH SAID CONTACTING ZONE AND SAIDD DISENGAGING ZONE, THE IMPROVEMENT WHICH COMPRISES ESTABLISHING AA SLOPING MANIFOLD
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) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |