US2889414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination recording heads
Assignee: General Dynamics Corp
•
Filing: 1954-01-11
•
Granted: 1959-06-02
•
Expires: 1974-01-11
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Gratian
- 👤 William B Latchford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:32
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1278; G11B5/187; G11B5/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2272821A
Cited
US2423339A
Cited
US2488717A
Cited
US2675429A
Cited
US2660622A
Cited
US2628285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |