Patent US1399997A successfully refreshed from Google Patents.
US1399997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telegraph system
Assignee: AT&T Inc
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Filing: 1918-01-03
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Granted: 1921-12-13
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Expires: 1938-01-03
Abstract
No abstract record available.
Inventors
- 👤 Paul M Rainey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:14
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/42
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) | 1924-12-12 | 1925-06-13 | 1925-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-12-12 | 1929-06-13 | 1929-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-12-12 | 1933-06-13 | 1933-12-13 | $7700.00 | Window Closed / Lapsed |