Patent US3140361A successfully refreshed from Google Patents.
US3140361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head assembly
Assignee: Ampex Corp
•
Filing: 1960-12-30
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Granted: 1964-07-07
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Expires: 1980-12-30
Abstract
No abstract record available.
Inventors
- 👤 Donald F Eldridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:42
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/147; G11B5/187; G11B5/255
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2674659A
Cited
US2895015A
Cited
US2939920A
Cited
US2941045A
Cited
US2911481A
Cited
US2914621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |