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Patent US417992A successfully refreshed from Google Patents.
US417992A
Expired / Lapsed
US
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Underground electric conduit
Assignee: —
•
Filing: —
•
Granted: 1889-12-24
•
Expires: 1906-12-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:21
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/18; Y; Y10; Y10S; Y10S220/00; Y10S220/918
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) | 1892-12-23 | 1893-06-24 | 1893-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1896-12-23 | 1897-06-24 | 1897-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1900-12-24 | 1901-06-25 | 1901-12-25 | $7700.00 | Window Closed / Lapsed |