US3198623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas sealing and continuous charging method for blast furnace
Assignee: Inland Steel Co
•
Filing: 1961-09-01
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Granted: 1965-08-03
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Expires: 1981-09-01
Abstract
No abstract record available.
Inventors
- 👤 Douglas N Evans
- 👤 Charles D Elder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:03
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/18; C21B7/20; F; F27; F27B; F27B1/00; F27B1/10; F27B1/20; F27D; F27D99/00; F27D99/0073
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A METHOD FOR USE IN CONJUNCTION WITH A FURNACE MAINTAINED AT AN INTERNAL PRESSURE ABOVE ATMOSPHERIC PRESSURE AND HAVING AN UNOBSTRUCTED UPPER OPENING THROUGH WHICH CHARGING MATGERIAL IS CONTINUOUSLY INTRODUCED INTO THE FURNACE, SAID METHOD PREVENTING THE ESCAPE OF A FIRST GAS FROM WITHIN SAID FURNACE OUTWARDLY THROUGH SAID OPENING, THE STEPS OF: CONTINUOUSLY MAINTAINING SAID OPENING IN AN OPEN CONDITION DURING THE ENTIRE NORMAL OPERATION OF THE FURNACE; CONTINUOUSLY DIRECTING A STREAM OF A SECOND GAS DIRECTLY AT SAID OPENING; AND CONTROLLING THE VELOCITY OF SAID SECOND GAS SO THAT THE VELOCITY PRESSURE OF THE SECOND GAS AT SAID OPENING IS AT LEAST EQUAL TO THE STATIC PRESSURE OF SAID FIRST GAS WITHIN SAID FURNACE, TO PROVIDE A GAS SEAL AT SAID OPENING IN THE FORM OF A FIRST GAS-SECOND GAS INTERFACE.
Claim 2
Dependent Claim
134 words
IN A METHOD FOR USE IN CONJUNCTION WITH A FURNACE MAINTAINED AT AN INTERNAL PRESSURE ABOVE ATMOSPHERIC PRESSURE AND HAVING AN UNOBSTRUCTED UPPER OPENING THROUGH WHICH CHARGING MATGERIAL IS CONTINUOUSLY INTRODUCED INTO THE FURNACE, SAID METHOD PREVENTING THE ESCAPE OF A FIRST GAS FROM WITHIN SAID FURNACE OUTWARDLY THROUGH SAID OPENING, THE STEPS OF: CONTINUOUSLY MAINTAINING SAID OPENING IN AN OPEN CONDITION DURING THE ENTIRE NORMAL OPERATION OF THE FURNACE; CONTINUOUSLY DIRECTING A STREAM OF A SECOND GAS DIRECTLY AT SAID OPENING; AND CONTROLLING THE VELOCITY OF SAID SECOND GAS SO THAT THE VELOCITY PRESSURE OF THE SECOND GAS AT SAID OPENING IS AT LEAST EQUAL TO THE STATIC PRESSURE OF SAID FIRST GAS WITHIN SAID FURNACE, TO PROVIDE A GAS SEAL AT SAID OPENING IN THE FORM OF A FIRST GAS-SECOND GAS INTERFACE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |