Patent US841704A successfully refreshed from Google Patents.
Patent US3202503A successfully refreshed from Google Patents.
US3202503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of high quality steel from iron sand
Assignee: Yawata Iron and Steel Co Ltd
•
Filing: 1961-05-01
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Granted: 1965-08-24
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Expires: 1981-05-01
Abstract
No abstract record available.
Inventors
- 👤 Shimamura Tetsuo
- 👤 Sasagawa Kiyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:21
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/08; C21B13/006; C21B13/14; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2741555A
Cited
US2750277A
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US2653088A
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US2806779A
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US2919983A
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US3028231A
Cited
US3032410A
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US3029141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |