US3783034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming an insulating film of good punching characteristics on electrical steel sheets and strips
Assignee: Nippon Steel Corp
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Filing: 1971-08-25
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Granted: 1974-01-01
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Expires: 1991-08-25
Abstract
Abstract A PROCESS FOR PRODUCING A STABLE INSULATING FILM OF GOOD PUNCHING CHARACTERISTICS ON AN ELECTRICAL STEEL SHEET AND STRIP, WHICH COMPRISED DISOLVING AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF OXIDES, HYDROXIDES AND CARBONATES OF DIVALENT METALS TO AT LEAST ABOUT THEIR DISSOLVING LIMIT IN A SOLUTION CONTAINING AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF CHROMIC ACID AND BICHROMATES, ADDING AN EMULSION TYPE RESIN TO THE SOLUTION, AND COATING THE THUS OBTAINED TREATING SOLUTION ONTO A STEEL SHEET AND THEN BAKING THE COATED SHEET.
Inventors
- 👤 M Kitayama
- 👤 M Nakamura
- 👤 M Inaoka
- 👤 H Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:29
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/04; H01; H01B; H01B3/00; H01B3/002; H01B3/006; H01B3/02; H01B3/10; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F1/18; H01F41/00; H01F41/02; H01F41/0206
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |