US2594495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording system for call data in automatic telephony
Assignee: AT&T Inc
•
Filing: 1947-09-04
•
Granted: 1952-04-29
•
Expires: 1967-09-04
Abstract
No abstract record available.
Inventors
- 👤 John B Retallack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2089309A
Cited
US2254933A
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US2297365A
Cited
US2298519A
Cited
US2355903A
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US2513112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |