Patent US2592468A successfully refreshed from Google Patents.
US2592468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cement
Assignee: Standard Oil Development Co
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Filing: 1947-12-06
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Granted: 1952-04-08
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Expires: 1967-12-06
Abstract
No abstract record available.
Inventors
- 👤 Walter A Rex
- 👤 Chester L Read
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:02
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE METHOF OF MANUFACTURING CEMENT FROM OIL SHALE CONTAINING SILICA, ALUMINA AND IRON OXIDE IN PROPORTION SUITABLE FOR CEMENT MANUFACTURE, WHICH COMPRISES SUBJECTING COARSELY CRUSHED FRESH OIL SHALE IN THE FORM OF A DENSE TURBULENT MASS OF SUBDIVIDED SOLIDS FLUIDIZED BY AN UPWARDLY FLOWING GAS TO DISTILLATION AT A DISTILLATION TEMPERATURE IN A DISTILLATION ZONE, WITHDRAWING VOLATILE DISTILLATION PRODUCTS FROM SAID DISTILLATION ZONE, WITHDRAWING SPENT CARBONACEOUS SHALE RESIDUE FROM SAID DISTILLATION ZONE, CIRCULATING SAID RESIDUE TO A HEATING ZONE, MAINTAINING SAID RESIDUE IN SAID HEATING ZONE IN THE FORM OF A DENSE TURBULENT MASS FLUIDIZED BY AN UPWARDLY FLOWING GAS, SUBJECTING A PORTION OF THE CARBONACEOUS CONSTITUENTS OF SAID RESIDUE TO COMBUSTION IN SAID HEATING ZONE TO HEAT THE SOLIDS THEREIN TO A TEMPERATURE BETWEEN ABOUT 1100* AND 1800* F. BUT HIGHER THAN SAID DISTILLATION TEMPERATURE, CIRCULATING SOLIDS FROM SAID HEATING ZONE TO SAID
Claim 2
Dependent Claim
144 words
THE METHOF OF MANUFACTURING CEMENT FROM OIL SHALE CONTAINING SILICA, ALUMINA AND IRON OXIDE IN PROPORTION SUITABLE FOR CEMENT MANUFACTURE, WHICH COMPRISES SUBJECTING COARSELY CRUSHED FRESH OIL SHALE IN THE FORM OF A DENSE TURBULENT MASS OF SUBDIVIDED SOLIDS FLUIDIZED BY AN UPWARDLY FLOWING GAS TO DISTILLATION AT A DISTILLATION TEMPERATURE IN A DISTILLATION ZONE, WITHDRAWING VOLATILE DISTILLATION PRODUCTS FROM SAID DISTILLATION ZONE, WITHDRAWING SPENT CARBONACEOUS SHALE RESIDUE FROM SAID DISTILLATION ZONE, CIRCULATING SAID RESIDUE TO A HEATING ZONE, MAINTAINING SAID RESIDUE IN SAID HEATING ZONE IN THE FORM OF A DENSE TURBULENT MASS FLUIDIZED BY AN UPWARDLY FLOWING GAS, SUBJECTING A PORTION OF THE CARBONACEOUS CONSTITUENTS OF SAID RESIDUE TO COMBUSTION IN SAID HEATING ZONE TO HEAT THE SOLIDS THEREIN TO A TEMPERATURE BETWEEN ABOUT 1100* AND 1800* F. BUT HIGHER THAN SAID DISTILLATION TEMPERATURE, CIRCULATING SOLIDS FROM SAID HEATING ZONE TO SAID
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) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |