Patent US220936A successfully refreshed from Google Patents.
US220936A
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US
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Improvement in couplings for underground-telegraph lines
Assignee: —
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Filing: —
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Granted: 1879-10-28
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Expires: 1896-10-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/10; H02G15/115
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) | 1882-10-27 | 1883-04-28 | 1883-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1886-10-27 | 1887-04-28 | 1887-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1890-10-27 | 1891-04-28 | 1891-10-28 | $7700.00 | Window Closed / Lapsed |