US3060014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-furnace for refining metal
Assignee: Yawata Iron and Steel Co Ltd
•
Filing: 1959-04-14
•
Granted: 1962-10-23
•
Expires: 1979-04-14
Abstract
No abstract record available.
Inventors
- 👤 Aihara Masumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:32
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A METHOD OF MAKING STEEL, COMPRISING PLACING ONLY A CHARGE OF COLD MATERIAL, CONSISTING ESSENTIALLY OF IRON ORE, SCRAP IRON AND STEEL AND PIG IRON, TO BE MELTED IN A FIRST FURNACE ADJACENT TO A SECOND FURNACE WHICH CONTAINS A MOLTEN CHARGE OT WHICH MOLTEN PIG IRON HAS BEEN ADDED, DIRECTING A STREAM OF OXYGEN AGAINST THE MOLTEN CHARGE IN THE SECOND FURNACE TO REFINE IT AND THEREBY GENERATING COMBUSTIBLE WASTE GAS, PASSING THE WASTE GAS INTO THE FIRST FURNACE AND BURNING IT THEREIN, THEREBY MELTING THE COLD CHARGE THEREIN BY COMBUSTION OF SAID WASTE GAS, THEREAFTER EMPTYING THE SECOND FURNACE AND RELOADING IT ONLY WITH A CHARGE OF COLD MATERIAL CONSISTING ESSENTIALLY OF IRON ORE, SCRAP IRON AND STEEL AND PIG IRON TO BE MELTED, ADDING MOLTEN PIG IRON TO THE MELTED CHARGE IN THE FIRST FURNACE, DIRECTING A STREAN OF OXYGEN AGAINST THE MOLTEN CHARGE IN THE FIRST FURNACE TO REFINE IT AND THEREBY GENERATING COMBUSTIBLE WASTE GAS, PASSING THE LAST-MENTIONED WASTE GAS INTO THE SECOND FURNACE AND BURNING IT THEREIN, THEREBY MELTING THE COLD CHARGE THEREIN BY COMBUSTION OF SAID WASTE GAS, AND CONTINUOUSLY REPEATING THE FOREGOING STEPS IN THE SEQUENCE SET FORTH.
Claim 2
Independent Claim
196 words
A METHOD OF MAKING STEEL, COMPRISING PLACING ONLY A CHARGE OF COLD MATERIAL, CONSISTING ESSENTIALLY OF IRON ORE, SCRAP IRON AND STEEL AND PIG IRON, TO BE MELTED IN A FIRST FURNACE ADJACENT TO A SECOND FURNACE WHICH CONTAINS A MOLTEN CHARGE OT WHICH MOLTEN PIG IRON HAS BEEN ADDED, DIRECTING A STREAM OF OXYGEN AGAINST THE MOLTEN CHARGE IN THE SECOND FURNACE TO REFINE IT AND THEREBY GENERATING COMBUSTIBLE WASTE GAS, PASSING THE WASTE GAS INTO THE FIRST FURNACE AND BURNING IT THEREIN, THEREBY MELTING THE COLD CHARGE THEREIN BY COMBUSTION OF SAID WASTE GAS, THEREAFTER EMPTYING THE SECOND FURNACE AND RELOADING IT ONLY WITH A CHARGE OF COLD MATERIAL CONSISTING ESSENTIALLY OF IRON ORE, SCRAP IRON AND STEEL AND PIG IRON TO BE MELTED, ADDING MOLTEN PIG IRON TO THE MELTED CHARGE IN THE FIRST FURNACE, DIRECTING A STREAN OF OXYGEN AGAINST THE MOLTEN CHARGE IN THE FIRST FURNACE TO REFINE IT AND THEREBY GENERATING COMBUSTIBLE WASTE GAS, PASSING THE LAST-MENTIONED WASTE GAS INTO THE SECOND FURNACE AND BURNING IT THEREIN, THEREBY MELTING THE COLD CHARGE THEREIN BY COMBUSTION OF SAID WASTE GAS, AND CONTINUOUSLY REPEATING THE FOREGOING STEPS IN THE SEQUENCE SET FORTH.
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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) | 1965-10-22 | 1966-04-23 | 1966-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-22 | 1970-04-23 | 1970-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-22 | 1974-04-23 | 1974-10-23 | $7700.00 | Window Closed / Lapsed |