US2882236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing magnet cores having a substantially rectangular outline of hysteresis loop
Assignee: US Philips Corp
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Filing: 1955-01-10
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Granted: 1959-04-14
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Expires: 1975-01-10
Abstract
No abstract record available.
Inventors
- 👤 Gorter Evert Willem
- 👤 Esveldt Cornelis Jacobus
- 👤 Heide Hendrik Van Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:15
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A FERROMAGNETIC FERRITE HAVING A SUBSTANTIALLY SQUARE HYSTERESIS LOOP FORMED BY FIRING AT A TEMPERATURE OF ABOUT 1400 TO 1500* C. A MIXTURE OF COBALT, MANGANESE, AND FERRIC OXIDES IN PROPORTIONS FORMING A COMPOSITION HAVING THE FORMULA:
Claim 2
Dependent Claim
37 words
A FERROMAGNETIC FERRITE HAVING A SUBSTANTIALLY SQUARE HYSTERESIS LOOP FORMED BY FIRING AT A TEMPERATURE OF ABOUT 1400 TO 1500* C. A MIXTURE OF COBALT, MANGANESE, AND FERRIC OXIDES IN PROPORTIONS FORMING A COMPOSITION HAVING THE FORMULA:
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) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |