US3070670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic record head assembly
Assignee: Ampex Corp
•
Filing: 1960-02-23
•
Granted: 1962-12-25
•
Expires: 1980-02-23
Abstract
No abstract record available.
Inventors
- 👤 Donald F Eldridge
- 👤 Eric D Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:58
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86; G11B5/02; G11B5/127; G11B5/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2272821A
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US2251300A
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US2536810A
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US2532917A
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US2786897A
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US2803708A
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US2685618A
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US2840639A
Cited
GB775050A
Cited
US3032612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |