Patent US1256126A successfully refreshed from Google Patents.
US1256126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone-exchange system.
Assignee: AT&T Inc
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Filing: 1916-05-25
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Granted: 1918-02-12
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Expires: 1936-05-25
Abstract
No abstract record available.
Inventors
- 👤 Charles L Goodrum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:23
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/50; H04M3/51; H04M3/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1921-02-11 | 1921-08-13 | 1922-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-02-11 | 1925-08-13 | 1926-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-02-11 | 1929-08-13 | 1930-02-12 | $7700.00 | Window Closed / Lapsed |