US3788835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron ore reduction process(nu-9)
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1970-12-30
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Granted: 1974-01-29
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Expires: 1990-12-30
Abstract
Abstract A STAGED FLUIDIZED IRON ORE REDUCTION PROCESS IS PROVIDED IN WHICH CARBON IS DEPOSITED ON THE IRON ORE IN THE REDUCTION ZONE WHERE THE MAJOR PORTION OF THE METALLIZATION IS EFFECTED WITH THE GASEOUS REDUCTANT. AFTER FURTHER GASEOUS REDUCTION TO A HIGHLY METALLIZED MATERIAL THE REDUCED ORE IS HELD UNDER CONDITIONS SUFFICIENT TO ALLOW THE DEPOSITED CARBON TO INTERACT WITH RESIDUAL OXIDES THEREBY FURTHER INCREASING THE METALLIZATION OF THE IRON ORE.
Inventors
- 👤 W Lewis
- 👤 J Paynter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:28
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0033; 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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |