Patent US424575A successfully refreshed from Google Patents.
US424575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulation
Assignee: —
•
Filing: —
•
Granted: 1890-04-01
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Expires: 1907-04-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:17
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/06009; G06K19/06018; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/082
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) | 1893-03-31 | 1893-09-30 | 1894-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1897-03-31 | 1897-09-30 | 1898-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1901-04-01 | 1901-10-01 | 1902-04-02 | $7700.00 | Window Closed / Lapsed |