Patent US428575A successfully refreshed from Google Patents.
US428575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of building electrical converters
Assignee: —
•
Filing: —
•
Granted: 1890-05-20
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Expires: 1907-05-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:18
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/25; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49073; Y10T29/49075; Y10T29/49078
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) | 1893-05-19 | 1893-11-18 | 1894-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1897-05-19 | 1897-11-18 | 1898-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1901-05-20 | 1901-11-19 | 1902-05-21 | $7700.00 | Window Closed / Lapsed |