Patent US3369813A successfully refreshed from Google Patents.
US3369813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for recording and reproducing sounds on magnetic sheets
Assignee: TDK Corp
•
Filing: 1965-10-18
•
Granted: 1968-02-20
•
Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Nagashima Tatsuo
- 👤 Suganuma Fujio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:41
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/34; G11B5/00; G11B5/48; G11B5/52; G11B5/58; G11B5/596
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |