Patent US3481876A successfully refreshed from Google Patents.
US3481876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manganese zinc ferrite containing calcium oxide and at least one of tantalum oxide and niobium oxide
Assignee: TDK Corp
•
Filing: 1966-08-12
•
Granted: 1969-12-02
•
Expires: 1986-08-12
Abstract
No abstract record available.
Inventors
- 👤 Teitaro Hiraga
- 👤 Syoichi Wakabayasi
- 👤 Yoshishige Towatari
- 👤 Tadao Inuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:52
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2658
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3106534A
Cited
US3344072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |