Patent US2400032A successfully refreshed from Google Patents.
Patent US3060268A successfully refreshed from Google Patents.
Patent US3348037A successfully refreshed from Google Patents.
US2229326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound head for magnetic recording machine
Assignee: Individual
•
Filing: 1937-10-25
•
Granted: 1941-01-21
•
Expires: 1957-10-25
Abstract
No abstract record available.
Inventors
- 👤 Herman S Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/105; G11B5/127; G11B5/29
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) | 1944-01-21 | 1944-07-22 | 1945-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-01-21 | 1948-07-22 | 1949-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-01-21 | 1952-07-22 | 1953-01-21 | $7700.00 | Window Closed / Lapsed |