US2501189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of metallic iron from iron oxides
Assignee: Individual
•
Filing: 1947-03-17
•
Granted: 1950-03-21
•
Expires: 1967-03-17
Abstract
No abstract record available.
Inventors
- 👤 Robert D Pike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:50
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/10; C21B13/0073; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1638684A
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US1829268A
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US1902090A
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US2048112A
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GB466592A
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US2142100A
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US2132149A
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US2200772A
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US2287663A
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US2265812A
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US2367262A
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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) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |