US3720549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating coating and method of making the same
Assignee: General Electric Co
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Filing: 1970-09-23
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Granted: 1973-03-13
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Expires: 1990-09-23
Abstract
Abstract ELECTRICALLY INSULATING COATING FOR STRAND ANNEALED MAGNETIC SILICON STEEL IS COMPOSED OF AN AQUEOUS MIXTURE OF (1) THE REACTION PRODUCT OF CHROMIUM TRIOXIDE, FORMIC ACID AND PHOSPHORIC ACID, (2) PHOSPHORIC ACID, AND (3) COLLOIDAL SILICA.
Inventors
- 👤 R Hirst
- 👤 G Desnoyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:49
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775; H01F1/14783; C; C23; C23C; C23C22/00; C23C22/73; C23C22/74; H01B; H01B3/00; H01B3/02; H01B3/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |