Patent US3469969A successfully refreshed from Google Patents.
US3469969A
Expired / Lapsed
US
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Process for reducing iron ores
Assignee: Individual
•
Filing: 1965-10-23
•
Granted: 1969-09-30
•
Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Hermann Schenck
- 👤 Werner Wenzel
- 👤 Franz-Rudolf Block
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:57
CPC Classifications
C; C21; C21B; C21B15/00; C21B15/003; G; G21; G21D; G21D9/00; Y; Y02; Y02E; Y02E30/00; Y02P; Y02P10/00; Y02P10/10; Y02P10/122; Y02P10/143
Claims Analysis
Total Claims: 0
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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) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |