US3203839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing nonoriented silicon steel sheets
Assignee: Yawata Iron and Steel Co Ltd
•
Filing: 1963-02-18
•
Granted: 1965-08-31
•
Expires: 1983-02-18
Abstract
No abstract record available.
Inventors
- 👤 Takahashi Kenji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:33
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1233; C22; C22C; C22C38/00; C22C38/02; C22C38/06; C21D8/1244; C21D8/1266; C21D8/1272
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2307391A
Cited
US2378321A
Cited
DE1009214B
Cited
US2875114A
Cited
US2965526A
Cited
GB870220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |