Patent US828090A successfully refreshed from Google Patents.
US828090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic locking-switch.
Assignee: AT&T Inc
•
Filing: 1904-05-09
•
Granted: 1906-08-07
•
Expires: 1924-05-09
Abstract
No abstract record available.
Inventors
- 👤 Henry M Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:22
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/32; H01H3/50; H01H3/503
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1909-08-06 | 1910-02-05 | 1910-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1913-08-06 | 1914-02-05 | 1914-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1917-08-06 | 1918-02-05 | 1918-08-07 | $7700.00 | Window Closed / Lapsed |