US2977263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic cores and methods of making the same
Assignee: AT&T Inc
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Filing: 1959-12-03
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Granted: 1961-03-28
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Expires: 1979-12-03
Abstract
No abstract record available.
Inventors
- 👤 Harendza-Harinxma Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:36
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/20; H01F1/22; H01F1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN A PROCESS OF MAKING A MAGNETIC CORE WHEREIN FINELY DIVIDED MAGNETIC PARTICLES ARE GIVEN AN INSULATING COATING COMPRISING A REFRACTORY METAL SILICATE, MAGNESIUM HYDROXIDE AND AN ALKALI METAL SILICATE, WHEREIN THE INSULATED PARTICLES ARE COMPRESSED INTO A CORE, AND WHEREIN THE CORE IS FIRED AT A TEMPERATURE OF 1000 TO 1300*F., THE IMPROVED METHOD WHICH COMPRISES THE ADDITIONAL STEPS OF WETTING THE FIRED CORE WITH WATER, AND THEN REFIRING THE CORE AT A TEMPERATURE OF 1000 TO 1300*F.
Claim 2
Dependent Claim
79 words
IN A PROCESS OF MAKING A MAGNETIC CORE WHEREIN FINELY DIVIDED MAGNETIC PARTICLES ARE GIVEN AN INSULATING COATING COMPRISING A REFRACTORY METAL SILICATE, MAGNESIUM HYDROXIDE AND AN ALKALI METAL SILICATE, WHEREIN THE INSULATED PARTICLES ARE COMPRESSED INTO A CORE, AND WHEREIN THE CORE IS FIRED AT A TEMPERATURE OF 1000 TO 1300*F., THE IMPROVED METHOD WHICH COMPRISES THE ADDITIONAL STEPS OF WETTING THE FIRED CORE WITH WATER, AND THEN REFIRING THE CORE AT A TEMPERATURE OF 1000 TO 1300*F.
References Cited (Backward Citations)
US2105070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |