US2565058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic magnetic materials with high saturation-flux density
Assignee: Steatite Research Corp
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Filing: 1949-05-26
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Granted: 1951-08-21
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Expires: 1969-05-26
Abstract
No abstract record available.
Inventors
- 👤 Albers-Schoenberg Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2625
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A FERROMAGNETIC CERAMIC MATERIAL CONSISTING MAINLY OF IRON OXIDE COMPOUNDS OF THE MAGNETITETYPE, SUITABLE FOR THE USE AT FREQUENCIES BETWEEN 60 CS. AND ABOUT 10 MCS. COMPOSED OF THE BIVALENT METAL OXIDES MGO, MNO, ZNO AND NIO AND FE2O3 IN THE MOL RATIO OF .05-.15 MGO:.2-.4 MNO:.3-.4 ZNO:.15-.4 NIO:ABOUT 1.0 FE2O3, THE TOTAL MOL RATIO OF SAID BIVALENT METAL OXIDES TO FE2O3 BEING APPROXIMATELY 1:1 SAID MATERIAL HAVING A CURIE POINT OF AT LEAST 250* C., AN INITIAL PERMEABILITY BETWEEN 200 AND 350, A SATURATION-FLUX DENSITY OF AT LEAST 3750 AND A TEMPERATURE COEFFICIENT OF U OF 25 TO 35% (MEASURED ON A TOROID) BETWEEN ROOM TEMPERATURE AND 125* C.
Claim 2
Dependent Claim
110 words
A FERROMAGNETIC CERAMIC MATERIAL CONSISTING MAINLY OF IRON OXIDE COMPOUNDS OF THE MAGNETITETYPE, SUITABLE FOR THE USE AT FREQUENCIES BETWEEN 60 CS. AND ABOUT 10 MCS. COMPOSED OF THE BIVALENT METAL OXIDES MGO, MNO, ZNO AND NIO AND FE2O3 IN THE MOL RATIO OF .05-.15 MGO:.2-.4 MNO:.3-.4 ZNO:.15-.4 NIO:ABOUT 1.0 FE2O3, THE TOTAL MOL RATIO OF SAID BIVALENT METAL OXIDES TO FE2O3 BEING APPROXIMATELY 1:1 SAID MATERIAL HAVING A CURIE POINT OF AT LEAST 250* C., AN INITIAL PERMEABILITY BETWEEN 200 AND 350, A SATURATION-FLUX DENSITY OF AT LEAST 3750 AND A TEMPERATURE COEFFICIENT OF U OF 25 TO 35% (MEASURED ON A TOROID) BETWEEN ROOM TEMPERATURE AND 125* C.
References Cited (Backward Citations)
US2382136A
Cited
US2452531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |