US2591460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for providing magnetic sheet steel with an insulative film
Assignee: General Electric Co
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Filing: 1949-08-17
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Granted: 1952-04-01
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Expires: 1969-08-17
Abstract
No abstract record available.
Inventors
- 👤 Morrill Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:55
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF PROVIDING A DECARBURIZED SILICON STEEL SHEET MATERIAL WITH AN INSULATING OXIDE COATING WHICH COMPRISES BOX ANNEALING SAID MATERIAL AT A TEMPERATURE ABOVE 800* C. IN A REDUCING ATMOSPHERE WITH NO SPACING BETWEEN ADJACENT LAMINATIONS OF THE SHEET MATERIAL, COOLING THE MATERIAL TO A TEMPERATURE OF FROM ABOUT 500* TO 600* C. AND WHILE HOLDING THE STEEL AT THIS TEMPERATURE REPLACING THE REDUCING ATMOSPHERE WITH NITROGEN AND REPLACING THE NITROGEN WITH AN OXYGEN ATMOSPHERE.
Claim 2
Independent Claim
76 words
THE METHOD OF PROVIDING A DECARBURIZED SILICON STEEL SHEET MATERIAL WITH AN INSULATING OXIDE COATING WHICH COMPRISES BOX ANNEALING SAID MATERIAL AT A TEMPERATURE ABOVE 800* C. IN A REDUCING ATMOSPHERE WITH NO SPACING BETWEEN ADJACENT LAMINATIONS OF THE SHEET MATERIAL, COOLING THE MATERIAL TO A TEMPERATURE OF FROM ABOUT 500* TO 600* C. AND WHILE HOLDING THE STEEL AT THIS TEMPERATURE REPLACING THE REDUCING ATMOSPHERE WITH NITROGEN AND REPLACING THE NITROGEN WITH AN OXYGEN ATMOSPHERE.
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) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |