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US2618709A
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Cylindrical contact magnetic head
Assignee: Eckert Mauchly Computer Corp
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Filing: 1949-07-16
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Granted: 1952-11-18
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Expires: 1969-07-16
Abstract
No abstract record available.
Inventors
- 👤 Jr John Presper Eckert
- 👤 Mock Leon Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/62; G11B15/602; G11B5/00; G11B5/10; G11B5/105; G11B5/127; G11B5/17; G11B5/187; G11B5/29; G11B5/295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |