US3522108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming electric insulating films on al - containing silicon steel sheet and surface-coated al-containing silicon steel sheet
Assignee: Nippon Steel Corp
•
Filing: 1967-03-17
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Granted: 1970-07-28
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Expires: 1987-03-17
Abstract
No abstract record available.
Inventors
- 👤 Takaaki Yamamoto
- 👤 Kaneo Akanuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:50
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775; H01F1/14783; C; C03; C03C; C03C4/00; C21; C21D; C21D1/00; C21D1/68; C21D1/70; C21D8/00; C21D8/12; C21D8/1277; C21D8/1283; C22; C22C; C22C38/00; C22C38/02; C23; C23C; C23C24/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3051589A
Cited
US3151000A
Cited
US3105781A
Cited
US3368712A
Cited
US3132056A
Cited
US3259526A
Cited
US3207636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |