US2675427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic scanning mechanism for scanning both tips and rings of calling lines and combining the results of these scanning operations
Assignee: AT&T Inc
•
Filing: 1951-12-21
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Granted: 1954-04-13
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Expires: 1971-12-21
Abstract
No abstract record available.
Inventors
- 👤 Neal D Newby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:10
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2257894A
Cited
US2400112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |