Patent US2946486A successfully refreshed from Google Patents.
Patent US1601940A successfully refreshed from Google Patents.
US1601940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telegraph system
Assignee: AT&T Inc
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Filing: 1922-10-03
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Granted: 1926-10-05
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Expires: 1942-10-03
Abstract
No abstract record available.
Inventors
- 👤 Allison A Clokey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:20
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/14; H04L5/18
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) | 1929-10-04 | 1930-04-05 | 1930-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-10-04 | 1934-04-05 | 1934-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-10-04 | 1938-04-05 | 1938-10-05 | $7700.00 | Window Closed / Lapsed |