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Patent US3458307A successfully refreshed from Google Patents.
US3458307A
Expired / Lapsed
US
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Method of blast furnace reduction of iron ores
Assignee: Armco Inc
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Filing: 1967-03-07
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Granted: 1969-07-29
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Expires: 1987-03-07
Abstract
No abstract record available.
Inventors
- 👤 William E Marshall
- 👤 Arthur P Kerschbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:55
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/06; C21B2100/00; C21B2100/20; C21B2100/22; C21B2100/40; C21B2100/44; C21B2100/60; C21B2100/64; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US891248A
Cited
US1755845A
Cited
US2142100A
Cited
US2598735A
Cited
US2727816A
Cited
US2837419A
Cited
US3375098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |