US452003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-magnet
Assignee: —
•
Filing: —
•
Granted: 1891-05-12
•
Expires: 1908-05-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:55
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/323; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
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) | 1894-05-11 | 1894-11-10 | 1895-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1898-05-11 | 1898-11-10 | 1899-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1902-05-12 | 1902-11-11 | 1903-05-13 | $7700.00 | Window Closed / Lapsed |