Patent US2965449A successfully refreshed from Google Patents.
US2965449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat recovery in fluosolids process
Assignee: Dorr Oliver Inc
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Filing: 1956-10-29
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Granted: 1960-12-20
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Expires: 1976-10-29
Abstract
No abstract record available.
Inventors
- 👤 Walfred W Jukkola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:25
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/10; F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
311 words
A PROCESS FOR EFFECING THE REDUCTION TO MAGNETIC OF FINELY DIVIDED IRON ORE SOLIDS IN A FLUIDIZED STATE BY TREATMENT IN A MULTI-STAGE FLUIDIZED SOLIDS SYSTEM, WHICH COMPRISES, MAINTAINING AN INITIAL PREHEATING BED OF IRON ORE SOLIDS IN A FLUIDIZED STATE WHILE CONTINUOUSLY FEEDING SUCH SOLIDS THERETO FOR PREHEATING TO AN INITIAL TEMPERATURE ADAPTED TO EFFECT CONDENSATION UNDER PRESSURE OF A CONFINED VAPORIZABLE LIQUID MEDIUM REFERRED TO BELOW, MAINTAINING A HEAT GENERATING PRE-HEATING BED OF IRON ORE SOLIDS IN A FLUIDIZED STATE DERIVED CONTINUOUSLY FROM SAID INITIAL PREHEATING BED FOR HEATING TO A HIGH TEMPERATURE AT LEAST AS HIGH AS THE OPTIMUM REDUCING TEMPERATURE BY THE COMBUSTION OF RESIDUAL REDUCING GAS PREPARATORY TO REDUCING TREATMENT PROPER, MAINTAINING A REDUCING BED OF SOLIDS IN A FLUIDIZED STATE TRANSFERRED THERETO CONTINUOUSLY FROM SAID HEAT GENERATING BED, FOR EFFECTING THE REDUCTION OF SAID IRON ORE SOLIDS TO MAGNETIC AT SAID OPTIMUM REDUCING TEMPERATURE, MAINTAINING AT LEAST ONE RECEIVING BED OF REDUCED SOLIDS IN A FLUIDIZED STATE TRANSFERRED THERETO CONTINUOUSLY FROM SAID RECUCING BED, WHILE CONTINUOUSLY DISCHARGING SUCH SOLIDS FROM SAID RECEIVING BED AT A LOWERED DISCHARGE TEMPERATURE, CONTINUOUSLY PASSING A REDUCING GAS UNDER PRESSURE UPFLOWING THROUGH SAID RECEIVING BED AT A RATE EFFECTIVE TO MAINTAIN THE FLUIDIZED STATE THEREOF, PASSING THE THUS PREHEATED REDUCING GAS FROM THE RECEIVING BED UPFLOWING THROUGH THE REDUCING BED AT A RATE EFFECTIVE TO MAINTAIN THE FLUIDIZED STATE THEREOF, AND REACTING SAID PREHEATED REDUCING GAS WITH THE ORE SOLIDS REDUCING THEM TO MAGNETITE, PASSING THE HOT SPENT REDUCING GASES CONTAINING A RESIDUAL PORTION OF REDUCING GAS FROM THE REDUCING BED UPFLOWING THROUGH SAID HEAT GENERATING BED WHILE INTRODUCING AIR TO EFFECT COMBUSTION OF SAID RESIDUAL PORTION OF REDUCING GAS FOR ESTABLISHING AND MAINTAINING SAID HIGH TEMPERATURE IN THIS BED, WITH BED SUCH AS TO MAINTAIN THE FLUIDIZED STATE THEREOF, PASSING SAID RESULTING HOT SPENT GASES FROM THE HEAT GENERATING
Claim 2
Dependent Claim
311 words
A PROCESS FOR EFFECING THE REDUCTION TO MAGNETIC OF FINELY DIVIDED IRON ORE SOLIDS IN A FLUIDIZED STATE BY TREATMENT IN A MULTI-STAGE FLUIDIZED SOLIDS SYSTEM, WHICH COMPRISES, MAINTAINING AN INITIAL PREHEATING BED OF IRON ORE SOLIDS IN A FLUIDIZED STATE WHILE CONTINUOUSLY FEEDING SUCH SOLIDS THERETO FOR PREHEATING TO AN INITIAL TEMPERATURE ADAPTED TO EFFECT CONDENSATION UNDER PRESSURE OF A CONFINED VAPORIZABLE LIQUID MEDIUM REFERRED TO BELOW, MAINTAINING A HEAT GENERATING PRE-HEATING BED OF IRON ORE SOLIDS IN A FLUIDIZED STATE DERIVED CONTINUOUSLY FROM SAID INITIAL PREHEATING BED FOR HEATING TO A HIGH TEMPERATURE AT LEAST AS HIGH AS THE OPTIMUM REDUCING TEMPERATURE BY THE COMBUSTION OF RESIDUAL REDUCING GAS PREPARATORY TO REDUCING TREATMENT PROPER, MAINTAINING A REDUCING BED OF SOLIDS IN A FLUIDIZED STATE TRANSFERRED THERETO CONTINUOUSLY FROM SAID HEAT GENERATING BED, FOR EFFECTING THE REDUCTION OF SAID IRON ORE SOLIDS TO MAGNETIC AT SAID OPTIMUM REDUCING TEMPERATURE, MAINTAINING AT LEAST ONE RECEIVING BED OF REDUCED SOLIDS IN A FLUIDIZED STATE TRANSFERRED THERETO CONTINUOUSLY FROM SAID RECUCING BED, WHILE CONTINUOUSLY DISCHARGING SUCH SOLIDS FROM SAID RECEIVING BED AT A LOWERED DISCHARGE TEMPERATURE, CONTINUOUSLY PASSING A REDUCING GAS UNDER PRESSURE UPFLOWING THROUGH SAID RECEIVING BED AT A RATE EFFECTIVE TO MAINTAIN THE FLUIDIZED STATE THEREOF, PASSING THE THUS PREHEATED REDUCING GAS FROM THE RECEIVING BED UPFLOWING THROUGH THE REDUCING BED AT A RATE EFFECTIVE TO MAINTAIN THE FLUIDIZED STATE THEREOF, AND REACTING SAID PREHEATED REDUCING GAS WITH THE ORE SOLIDS REDUCING THEM TO MAGNETITE, PASSING THE HOT SPENT REDUCING GASES CONTAINING A RESIDUAL PORTION OF REDUCING GAS FROM THE REDUCING BED UPFLOWING THROUGH SAID HEAT GENERATING BED WHILE INTRODUCING AIR TO EFFECT COMBUSTION OF SAID RESIDUAL PORTION OF REDUCING GAS FOR ESTABLISHING AND MAINTAINING SAID HIGH TEMPERATURE IN THIS BED, WITH BED SUCH AS TO MAINTAIN THE FLUIDIZED STATE THEREOF, PASSING SAID RESULTING HOT SPENT GASES FROM THE HEAT GENERATING
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |