US2842500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making ferrite structures
Assignee: International Business Machines Corp
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Filing: 1956-01-23
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Granted: 1958-07-08
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Expires: 1976-01-23
Abstract
No abstract record available.
Inventors
- 👤 John W Gibson
- 👤 Kenneth A Lundberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:51
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2625
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A METHOD OF FORMING A MAGNETIC BODY CHARACTERIZED BY HAVING IMPROVED MAGNETIC PROPERTIES COMPRISING, PREPARING AN INTIMATE MIXTURE OF 35 TO 50 MOL PERCENT FE2O3, 10 TO 40 MOL PERCENT MGO AND 15 TO 50 MOL PERCENT MNO, HEATING SAID MIXTURE TO FORM A SPINEL TYPE CRYSTALLINE STRUCTURE, FORMING A MOLDED COMPRESSED BODY FROM PARTICLES OF SAID SPINEL TYPE CRYSTALLINE MATERIAL, SUPPORTING SAID BODY ON A RARE METAL MEMBER CONSISTING PRIMARILY OF PLATINUM METAL, AND SUBSEQUENTLY SINTERING SAID MOLDED BODY.
Claim 2
Independent Claim
80 words
A METHOD OF FORMING A MAGNETIC BODY CHARACTERIZED BY HAVING IMPROVED MAGNETIC PROPERTIES COMPRISING, PREPARING AN INTIMATE MIXTURE OF 35 TO 50 MOL PERCENT FE2O3, 10 TO 40 MOL PERCENT MGO AND 15 TO 50 MOL PERCENT MNO, HEATING SAID MIXTURE TO FORM A SPINEL TYPE CRYSTALLINE STRUCTURE, FORMING A MOLDED COMPRESSED BODY FROM PARTICLES OF SAID SPINEL TYPE CRYSTALLINE MATERIAL, SUPPORTING SAID BODY ON A RARE METAL MEMBER CONSISTING PRIMARILY OF PLATINUM METAL, AND SUBSEQUENTLY SINTERING SAID MOLDED BODY.
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) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |