US162633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in duplex telegraphs
Assignee: —
•
Filing: —
•
Granted: 1875-04-27
•
Expires: 1892-04-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:59
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/14; H04L5/1423
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) | 1878-04-26 | 1878-10-26 | 1879-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1882-04-26 | 1882-10-26 | 1883-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1886-04-26 | 1886-10-26 | 1887-04-27 | $7700.00 | Window Closed / Lapsed |