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US2617704A
Expired / Lapsed
US
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Recording system
Assignee: AT&T Inc
•
Filing: 1947-07-15
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Granted: 1952-11-11
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Expires: 1967-07-15
Abstract
No abstract record available.
Inventors
- 👤 Rudolph F Mallina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:35
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/22; G06F7/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2080100A
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US2165924A
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US2165925A
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US2268203A
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US2298608A
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US2427383A
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US2401888A
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US2406353A
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US2579831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |