US847520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit-breaker.
Assignee: AT&T Inc
•
Filing: 1905-04-22
•
Granted: 1907-03-19
•
Expires: 1925-04-22
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Smythe
- 👤 Eastman A Burrows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:16
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/12; H01H71/24; H01H71/2472
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) | 1910-03-18 | 1910-09-17 | 1911-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1914-03-18 | 1914-09-17 | 1915-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1918-03-18 | 1918-09-17 | 1919-03-19 | $7700.00 | Window Closed / Lapsed |