US2809137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating coating for magnetic sheet material and method of making the same
Assignee: General Electric Co
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Filing: 1954-12-02
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Granted: 1957-10-08
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Expires: 1974-12-02
Abstract
No abstract record available.
Inventors
- 👤 Robinson Gladys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:23
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/04; C; C23; C23C; C23C24/00; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F1/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
THE METHOD OF PROVIDING A SEPARATING AND ELECTRICALLY INSULTING COATING FOR METALLIC SHEET MATERIAL WHICH COMPRISES APPLYING TO THE SURFACE OF THE METALLIC SHEET MATERIAL A SUSPENSION OF A FINELY DIVIDED INORGANIC REFRACTORY MATERIAL CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION CONTAINING SIO2 IN THE FORM OF REACTIVE, SUBMICROSCOPIC PARTICLES AND AT LEAST ONE REFRACTORY OXIDE: DRYING THE THUS APPLIED SUSPENSION SO AS TO FORM A REFRACTORY COATING ON THE SURFACE OF THE METALLIC SHEET MATERIAL; AND ANNEALING THE THUS COATED SHEETMATERIAL IN MULTI-PLY ASSEMBLY WITH THE REFRACTORY COATING SEPARATING ADJACENT SURFACES OF SAID SHEET MATERIAL, SO AS TO FORM A PERMANENT, TIGHTLY ADHERENT, ELECTRICALLY INSULATING LAYER OF REFRACTORY MATERIAL ON THE SURFACE OF THE METALLIC SURFACE MATERIAL.
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) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |