US3333839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for recovering unburned gases issued from metal refining furnaces
Assignee: Yawata Iron and Steel Co Ltd
•
Filing: 1964-09-29
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Granted: 1967-08-01
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Expires: 1984-09-29
Abstract
No abstract record available.
Inventors
- 👤 Maehara Shigeru
- 👤 Igarashi Isoji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:14
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/38; C21C5/40; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y10; Y10S; Y10S261/00; Y10S261/09; Y10S261/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN AN APPARATUS FOR RECOVERING UNBURNED GASES ISSUING FROM AN OXYGEN TOP-BLOWING CONVERTER AND HAVING A COOLER ADAPTED TO BE POSITIONED ABOVE AN OXYGEN TOPBLOWING CONVERTER AND CONTAINING COOLING WATER PIPES, A DUST COLLECTOR CONNECTED TO SAID COOLER, A GAS CONDUIT PIPE CONNECTED TO SAID DUST COLLECTOR AND ADAPTED TO BE CONNECTED TO A GAS HOLDER, A SUCTION MEANS IN SAID GAS CONDUIT PIPE, AND A GAS FLOW REGULATING VALVE IN SAID PIPE FOR REGULATING THE FLOW RATE OF THE GASES IN SAID CONDUIT PIPE, THE IMPROVEMENT COMPRISING A VERTICALLY MOVABLE HOOD IN CLOSE CONTACT WITH SAID COOLER, AND A REFRACTORY SHIELDING MEMBER DEPENDING FROM SAID MOVABLE HOOD AND EXTENDING COMPLETELY AROUND THE PERIPHERY OF THE HOOD AND ADAPTED TO COME IN CLOSE CONTACT WITH THE TOP OF THE CONVERTER, SAID SHIELDING MEMBER HAVING OPENINGS THEREIN OVER THE ENTIRE SURFACE AND THE RATIO OF THE TOTAL AREA OF THE OPENINGS TO THE TOTAL AREA OF THE SHIELD BEING BETWEEN 0.1 TO 0.8.
Claim 2
Dependent Claim
162 words
IN AN APPARATUS FOR RECOVERING UNBURNED GASES ISSUING FROM AN OXYGEN TOP-BLOWING CONVERTER AND HAVING A COOLER ADAPTED TO BE POSITIONED ABOVE AN OXYGEN TOPBLOWING CONVERTER AND CONTAINING COOLING WATER PIPES, A DUST COLLECTOR CONNECTED TO SAID COOLER, A GAS CONDUIT PIPE CONNECTED TO SAID DUST COLLECTOR AND ADAPTED TO BE CONNECTED TO A GAS HOLDER, A SUCTION MEANS IN SAID GAS CONDUIT PIPE, AND A GAS FLOW REGULATING VALVE IN SAID PIPE FOR REGULATING THE FLOW RATE OF THE GASES IN SAID CONDUIT PIPE, THE IMPROVEMENT COMPRISING A VERTICALLY MOVABLE HOOD IN CLOSE CONTACT WITH SAID COOLER, AND A REFRACTORY SHIELDING MEMBER DEPENDING FROM SAID MOVABLE HOOD AND EXTENDING COMPLETELY AROUND THE PERIPHERY OF THE HOOD AND ADAPTED TO COME IN CLOSE CONTACT WITH THE TOP OF THE CONVERTER, SAID SHIELDING MEMBER HAVING OPENINGS THEREIN OVER THE ENTIRE SURFACE AND THE RATIO OF THE TOTAL AREA OF THE OPENINGS TO THE TOTAL AREA OF THE SHIELD BEING BETWEEN 0.1 TO 0.8.
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) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |