US3132056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating coating for magnetic sheet material and method for producing the same
Assignee: General Electric Co
•
Filing: 1961-05-19
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Granted: 1964-05-05
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Expires: 1981-05-19
Abstract
No abstract record available.
Inventors
- 👤 James M Mcquade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:10
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/68; C21D1/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
THE METHOD OF PROVIDING A SEPARATOR COATING ON SILICON STEEL SHEET MATERIAL WHICH COMPRISES APPLYING ON THE SHEET MATERIAL A COATING OF MAGNESIUM OXIDE, APPLYING ON THE THUS-APPLIED COATING A COATING OF ALUMINUM OXIDE IN AN AMOUNT OF AT LEAST ABOUT .05 OZ./FT.2 OF THE SURFACE COATED, AND HEATING THE THUS-COATED SHEET MATERIAL AT ELEVATED TEMPERATURE FOR DEVELOPING THE MAGNETIC PROPERTIES THEREOF.
Claim 2
Independent Claim
62 words
THE METHOD OF PROVIDING A SEPARATOR COATING ON SILICON STEEL SHEET MATERIAL WHICH COMPRISES APPLYING ON THE SHEET MATERIAL A COATING OF MAGNESIUM OXIDE, APPLYING ON THE THUS-APPLIED COATING A COATING OF ALUMINUM OXIDE IN AN AMOUNT OF AT LEAST ABOUT .05 OZ./FT.2 OF THE SURFACE COATED, AND HEATING THE THUS-COATED SHEET MATERIAL AT ELEVATED TEMPERATURE FOR DEVELOPING THE MAGNETIC PROPERTIES THEREOF.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |