US3770639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hexagonal ferrites
Assignee: NEC Corp
•
Filing: 1971-01-21
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Granted: 1973-11-06
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Expires: 1991-01-21
Abstract
Abstract HEXAGONAL FERRITES ARE DISCLOSED HAVING ESSENTIALLY THE COMPOSITIONS EXPRESSED BY THE FORMULA MEIIIO$(6-X-Y)FE2O3$XME2IVO3$Y(NEIO$$MEIIO) WHEREIN MEIII DENOTES AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF SR, BA, AND CA, MEIV DENOTES AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF AL, CR, AND GA, MI DENOTES AT LEAT ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF NI, CU, ZN, CO, AND MG, MEII DENOTES AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF GE AND TI, X AND Y DENOTE MOL NUMBER LYING WITHIN THE RANGES OF Q<X$1.40 AND 0<Y$0.6, RESPECTIVELY, AND $DENOTES THE MEIO:MEIIO2 MOL SUBSTITUTION RATIO LYING WITHIN THE RANGE OF 0.6$$$1.4.
Inventors
- 👤 T Okazaki
- 👤 N Sakakibara
- 👤 T Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:12
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2633; C04B35/2683
Claims Analysis
Total Claims: 0
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |