US3274110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite process
Assignee: International Business Machines Corp
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Filing: 1962-12-21
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Granted: 1966-09-20
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Expires: 1982-12-21
Abstract
No abstract record available.
Inventors
- 👤 Getto Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:54
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
THE PROCESS OF SINTERING A RECTANGULAR HYSTERESIS LOOP FERRITE STRUCTURE OF THE FERROSPINEL SYSTEM TO ENHANCE RECTANGULARITY OF THE HYSTERESIS CHARACTERISTIC BY THE STEPS OF: PREPARING AN INTIMATE MIXTURE OF MANGANESE, COPPER AND FERRIC OXIDES WHEREIN ON A MOL BASIS THE MAJOR PROPORTION OF SAID MIXTURE IS MANGANESE OXIDE, THE MINOR PROPORTION OF SAID MIXTURE IS COPPER OXIDE AND THE PROPORTION OF IRON OXIDE IS THEREBETWEEN; CALCINING SAID MIXTURE AT A TEMPERATURE IN THE RANGE BETWEEN 600*C. TO 1000*C.; FIRING SAID MIXTURE AT A TEMPERATURE IN THE RANGE BETWEEN 1100*C. TO 1500*C. TO PRODUCE SOLID STATE REACTIONS WITHIN SAID MIXTURE TO PROVIDE SAME WITH A SPINEL CRYSTAL STRUCTURE; AND, ANEEALING SAID FERRITE MIXTURE BY COOLING SAID FIRED MIXTURE FROM SAID FIRING TEMPERATURE TO A TEMPERATURE ABOVE 600*C. WHICH IS SUFFICIENTLY HIGH TO ENHANCE OXYGEN ABSORPTION, SAID COOLING BEING CARRIED OUT IN A CONTROLLED OXIDIZING AMBIENT CONSISTING ESSENTIALLY OF AIR THAT INCLUDES FROM 1/2% TO 5% BY VOLUME OF WATER VAPOR.
Claim 2
Dependent Claim
160 words
THE PROCESS OF SINTERING A RECTANGULAR HYSTERESIS LOOP FERRITE STRUCTURE OF THE FERROSPINEL SYSTEM TO ENHANCE RECTANGULARITY OF THE HYSTERESIS CHARACTERISTIC BY THE STEPS OF: PREPARING AN INTIMATE MIXTURE OF MANGANESE, COPPER AND FERRIC OXIDES WHEREIN ON A MOL BASIS THE MAJOR PROPORTION OF SAID MIXTURE IS MANGANESE OXIDE, THE MINOR PROPORTION OF SAID MIXTURE IS COPPER OXIDE AND THE PROPORTION OF IRON OXIDE IS THEREBETWEEN; CALCINING SAID MIXTURE AT A TEMPERATURE IN THE RANGE BETWEEN 600*C. TO 1000*C.; FIRING SAID MIXTURE AT A TEMPERATURE IN THE RANGE BETWEEN 1100*C. TO 1500*C. TO PRODUCE SOLID STATE REACTIONS WITHIN SAID MIXTURE TO PROVIDE SAME WITH A SPINEL CRYSTAL STRUCTURE; AND, ANEEALING SAID FERRITE MIXTURE BY COOLING SAID FIRED MIXTURE FROM SAID FIRING TEMPERATURE TO A TEMPERATURE ABOVE 600*C. WHICH IS SUFFICIENTLY HIGH TO ENHANCE OXYGEN ABSORPTION, SAID COOLING BEING CARRIED OUT IN A CONTROLLED OXIDIZING AMBIENT CONSISTING ESSENTIALLY OF AIR THAT INCLUDES FROM 1/2% TO 5% BY VOLUME OF WATER VAPOR.
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |