US3020236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manganese-zinc ferrite and method of making
Assignee: General Precision Inc
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Filing: 1959-06-10
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Granted: 1962-02-06
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Expires: 1979-06-10
Abstract
No abstract record available.
Inventors
- 👤 Sommers Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2658; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A METHOD OF PREPARING A MANGANESE-ZINC FERRITE WITH HIGH MAGNETIC PERMEABILITY, SMALL LOSS FACTOR AND A CURIE POINT OF ABOUT 180*C, COMPRISING THE STEPS OF MILLING A CALCINED MIXTURES OF A PARTICLE SIZE OF NO GREATER THAN 1 MICRON CONSISTING ESSENTIALLY IN MOL PERCENTAGE OF ABOUT 52% FEO3, BETWEEN ABOUT 15% TO ABOUT 25% MNO2, BETWEEN ABOUT 15% TO ABOUT 15% MN3O4, AND ABOUT 18% ZNO, FOR A TIME PERIOD OF BETWEEN 24 TO 48 HOURS UTILIZING ONLY DISTILLED WATER DURING THE MILLING OPERATION TO KEEP THE ALKALI IMPURITY CONTENT AS LOW AS POSSIBLE; DRYING THE MIXTURE; MOLDING THE MIXTURE WITH A BINDER INTO DESIRED SHAPES; SINTERING THE MIXTURE FOR BETWEEN ABOUT 2 TO ABOUT 4 HOURS AT A TEMPERATURE OF BETWEEN ABOUT 1300*C, TO ABOUT 1350*C, IN AN ATMOSPHERE OF ABOUT 24% OXYGEN AND THE BALANCE SUBSTANTIALLY NITROGEN; SLOWLY REDUCING SAID OXYGEN CONTENT SO THAT AT THE END THE OXYGEN CONTENT IS ABOUT 1/2 OF 1%; AND, SLOWLY COOLING SAID SINTERED PRODUCT IN A NITROGEN ATMOSPHERE.
Claim 2
Independent Claim
167 words
A METHOD OF PREPARING A MANGANESE-ZINC FERRITE WITH HIGH MAGNETIC PERMEABILITY, SMALL LOSS FACTOR AND A CURIE POINT OF ABOUT 180*C, COMPRISING THE STEPS OF MILLING A CALCINED MIXTURES OF A PARTICLE SIZE OF NO GREATER THAN 1 MICRON CONSISTING ESSENTIALLY IN MOL PERCENTAGE OF ABOUT 52% FEO3, BETWEEN ABOUT 15% TO ABOUT 25% MNO2, BETWEEN ABOUT 15% TO ABOUT 15% MN3O4, AND ABOUT 18% ZNO, FOR A TIME PERIOD OF BETWEEN 24 TO 48 HOURS UTILIZING ONLY DISTILLED WATER DURING THE MILLING OPERATION TO KEEP THE ALKALI IMPURITY CONTENT AS LOW AS POSSIBLE; DRYING THE MIXTURE; MOLDING THE MIXTURE WITH A BINDER INTO DESIRED SHAPES; SINTERING THE MIXTURE FOR BETWEEN ABOUT 2 TO ABOUT 4 HOURS AT A TEMPERATURE OF BETWEEN ABOUT 1300*C, TO ABOUT 1350*C, IN AN ATMOSPHERE OF ABOUT 24% OXYGEN AND THE BALANCE SUBSTANTIALLY NITROGEN; SLOWLY REDUCING SAID OXYGEN CONTENT SO THAT AT THE END THE OXYGEN CONTENT IS ABOUT 1/2 OF 1%; AND, SLOWLY COOLING SAID SINTERED PRODUCT IN A NITROGEN ATMOSPHERE.
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) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |