US2864688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-step method of removing oxygen from iron oxide
Assignee: United States Steel Corp
•
Filing: 1958-01-28
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Granted: 1958-12-16
•
Expires: 1978-01-28
Abstract
No abstract record available.
Inventors
- 👤 Thomas F Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:41
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)
US962006A
Cited
GB187200A
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US1979729A
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US2287663A
Cited
US2528552A
Cited
US2481217A
Cited
US2711368A
Cited
US2752234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |