US2565111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic magnetic material with a small temperature coefficient
Assignee: Steatite Research Corp
•
Filing: 1949-05-26
•
Granted: 1951-08-21
•
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
2026-10-22 23:54
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2625
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 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 30 MCS., COMPOSED OF THE FOUR BIVALENT METAL OXIDES, MGO, MNO, ZNO, AND NIO, SILICA AND FE2O3, IN THE MOL RATIO OF.05-.35 MGO : .10-25 MNO : .15-.30 ZNO : .15-.40 NIKO : .10-20 SIO2 : ABOUT 1 FE2O3 THE TOTAL MOL PROPORTION OF THE BIVALENT METAL OXIDES TO FE2O3 BEING APPROXIMATELY 1:1 SAID MATERIAL HAVING A CURIE POINT OF AT LEAST 250* C. AN INITIAL PERMEABILITY BETWEEN 50 AND 150 AND A TEMPERATURE COEFFICIENT OF U (MEASURED ON A TOROID) OF LESS THAN 10% BETWEEN ROOM TEMPERATURE AND 120* C.
Claim 2
Dependent Claim
115 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 30 MCS., COMPOSED OF THE FOUR BIVALENT METAL OXIDES, MGO, MNO, ZNO, AND NIO, SILICA AND FE2O3, IN THE MOL RATIO OF.05-.35 MGO : .10-25 MNO : .15-.30 ZNO : .15-.40 NIKO : .10-20 SIO2 : ABOUT 1 FE2O3 THE TOTAL MOL PROPORTION OF THE BIVALENT METAL OXIDES TO FE2O3 BEING APPROXIMATELY 1:1 SAID MATERIAL HAVING A CURIE POINT OF AT LEAST 250* C. AN INITIAL PERMEABILITY BETWEEN 50 AND 150 AND A TEMPERATURE COEFFICIENT OF U (MEASURED ON A TOROID) OF LESS THAN 10% BETWEEN ROOM TEMPERATURE AND 120* C.
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) | 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 |