US2938813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated coating for silicon steel sheet
Assignee: Yawata Iron and Steel Co Ltd
•
Filing: 1956-10-31
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Granted: 1960-05-31
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Expires: 1976-10-31
Abstract
No abstract record available.
Inventors
- 👤 Matsuda Kamematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:58
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD FO PRODUCING AN INSULATED COATING ON THE SURFACE OF SILICON STEEL SHEET OR STRIP WHICH COMPRISES COATING AN AQUEOUS SOLUTION OF 10-60 WEIGHT PERCENT OF ZINC BICHROMATE IN THE FORM OF A THIN AND UNIFORM FILM ON THE SURFACE OF THE SILICON STEEL, AND HEATING THE THUS COATED SILICON STEEL AT A TEMPERATURE OF 500*-700*C. FOR A PERIOD OF 10-40 SECONDS, THEREBY A FIRMLY ADHERENT FILM OF INSULATION IS PRODUCED ON SAID SILICON STEEL SHEET OR STRIP.
Claim 2
Independent Claim
79 words
A METHOD FO PRODUCING AN INSULATED COATING ON THE SURFACE OF SILICON STEEL SHEET OR STRIP WHICH COMPRISES COATING AN AQUEOUS SOLUTION OF 10-60 WEIGHT PERCENT OF ZINC BICHROMATE IN THE FORM OF A THIN AND UNIFORM FILM ON THE SURFACE OF THE SILICON STEEL, AND HEATING THE THUS COATED SILICON STEEL AT A TEMPERATURE OF 500*-700*C. FOR A PERIOD OF 10-40 SECONDS, THEREBY A FIRMLY ADHERENT FILM OF INSULATION IS PRODUCED ON SAID SILICON STEEL SHEET OR STRIP.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |