US2683568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Message selector for magnetic reproducers
Assignee: AMPEX ELECTRIC Corp
•
Filing: 1949-05-16
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Granted: 1954-07-13
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Expires: 1969-05-16
Abstract
No abstract record available.
Inventors
- 👤 Harold W Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:56
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/06
Claims Analysis
Total Claims: 0
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US2484552A
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US2496103A
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US2514578A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |