US3028336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cadmium manganese ferrospinel composition
Assignee: International Business Machines Corp
•
Filing: 1957-09-25
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Granted: 1962-04-03
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Expires: 1977-09-25
Abstract
No abstract record available.
Inventors
- 👤 Barlane R Eichbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A HIGH SPEED FERRITE COMPOSITION OF THE CADMIUMMANGANESE FERRITE TYPE WHICH EXHIBITS A BR/BS RATIO GREATER THAN 0.7, A COERCIVE FORCE LESS THAN 0.8 OERSTEDS A DISCRIMINATION RATIO OF AT LEAST 4 AND SWITCHING TIMES OF LESS THAN 350 MILLIMICROSECONDS AT ONE AMPERE DRIVE CURRENT CONSISTING ESSENTIALLY OF THE REACTION PRODUCT PRODUCED BY HEATING TOGETHER A MIXTURE OF ABOUT 15-20 MOL PERCENT CDO, 32-70 MOL PERCENT MNO, 10-48 MOL PERCENT FE2O3 AND 0-5 MOL PERCENT NIO IN A NON-REDUCING ATMOSPHERE AT A TEMPERATURE WITHIN THE RANGE 1000-1500* C. FOR 15 MINUTES TO 3 HOURS, IN AN ENCLOSURE WHICH LIMITS VOLATILIZATION OF CADMIUM DURING SAID HEATING, COOLING TO ABOUT 950* C. DURING AN ADDITIONAL 5-60 MINUTES AND THEREAFTER QUENCHING TO ROOM TEMPERATURE.
Claim 2
Dependent Claim
121 words
A HIGH SPEED FERRITE COMPOSITION OF THE CADMIUMMANGANESE FERRITE TYPE WHICH EXHIBITS A BR/BS RATIO GREATER THAN 0.7, A COERCIVE FORCE LESS THAN 0.8 OERSTEDS A DISCRIMINATION RATIO OF AT LEAST 4 AND SWITCHING TIMES OF LESS THAN 350 MILLIMICROSECONDS AT ONE AMPERE DRIVE CURRENT CONSISTING ESSENTIALLY OF THE REACTION PRODUCT PRODUCED BY HEATING TOGETHER A MIXTURE OF ABOUT 15-20 MOL PERCENT CDO, 32-70 MOL PERCENT MNO, 10-48 MOL PERCENT FE2O3 AND 0-5 MOL PERCENT NIO IN A NON-REDUCING ATMOSPHERE AT A TEMPERATURE WITHIN THE RANGE 1000-1500* C. FOR 15 MINUTES TO 3 HOURS, IN AN ENCLOSURE WHICH LIMITS VOLATILIZATION OF CADMIUM DURING SAID HEATING, COOLING TO ABOUT 950* C. DURING AN ADDITIONAL 5-60 MINUTES AND THEREAFTER QUENCHING TO ROOM TEMPERATURE.
References Cited (Backward Citations)
CA492669A
Cited
US2565861A
Cited
US2549089A
Cited
GB735375A
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GB730703A
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GB760035A
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GB754370A
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US2715109A
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FR1128631A
Cited
US2950251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |