US660469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling system.
Assignee: Individual
•
Filing: 1898-03-25
•
Granted: 1900-10-23
•
Expires: 1918-03-25
Abstract
No abstract record available.
Inventors
- 👤 Edward J Silkman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:42
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/08; G09G1/12; H; H03; H03M; H03M1/00
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) | 1903-10-23 | 1904-04-23 | 1904-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-10-23 | 1908-04-23 | 1908-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-10-23 | 1912-04-23 | 1912-10-23 | $7700.00 | Window Closed / Lapsed |