US2882235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing magnetic cores
Assignee: US Philips Corp
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Filing: 1954-12-20
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Granted: 1959-04-14
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Expires: 1974-12-20
Abstract
No abstract record available.
Inventors
- 👤 Gorter Evert Willem
- 👤 Esveldt Cornelis Jacobus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:56
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2616
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
118 words
A MAGNETIC CORE HAVING A SUBSTANTIALLY RECTANGULAR HYSTERESIS LOOP AND CONSISTING ESSENTIALLY OF A LITHIUMCOPPER FERRITE HAVING THE FORMULA LIICU(1-2I)FE(2+I)O4, X BEING BETWEEN 0.25 AND 0.40, SAID FERRITE HAVING A SQUARENESS RATIO BT/BC1 WHICH IS GREATER THAN 0.70. AN (RS)MAX WHICH IS GREATER THAN 0.6 AND A COERCIVE FORCE (HC) WHICH IS LESS THAN 4 OERSTED, SAID CORE BEING PRO DUCED BY SINTERING AT A TEMPERATURE OF ABOUT 1100* C. TO 1200* C. IN AN ATMOSPHERE CONTAINING AT LEAST 50% BY VOLUME OF OXYGEN, A MIXTURE OF LIFE5O8 AND A PREFIRED MIXTURE OF COPPER OXIDE AND FERRIC OXIDE IN WHICH THE ATOMIC RATIO OF CU:FE IS 1:2 IN PROPORTIONS AND FOR A TIME SUFFICIENT TO PRODUCE SAID FERRITE.
References Cited (Backward Citations)
No citation records indexed.
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 |