Patent US771089A successfully refreshed from Google Patents.
Patent US3684486A successfully refreshed from Google Patents.
US3684486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct reduction of iron ore and the like
Assignee: Pullman Inc
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Filing: 1968-12-23
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Granted: 1972-08-15
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Expires: 1988-12-23
Abstract
Abstract I DISCLOSE A METHOD FOR THE PRODUTION OF SPONGE METAL, SAID METHOD COMPRISING THE STEPS OF PLACING A PREDETERMINED QUANTITY OF AN OXIDIC ORE OF SAID METAL IN A REDUCTIONAL ZONE, PREHEATING SAID ORE WITH NON-REDUCING GAS, AND PASSING A QUANTITY OF HOT REDUCING GAS THROUGH SAID ORE TO REDUCE SAID ORE TO SAID SPONGE METAL.
Inventors
- 👤 Mohamed A Osman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:23
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0073; C21B13/14; C21B13/146; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |