Patent US804176A successfully refreshed from Google Patents.
US804176A
Expired / Lapsed
US
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System of automatic signaling for electric railways.
Assignee: SPX Technologies Inc
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Filing: 1905-08-01
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Granted: 1905-11-07
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Expires: 1925-08-01
Abstract
No abstract record available.
Inventors
- 👤 Fitzhugh Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:24
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/221; B61L3/222
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) | 1908-11-06 | 1909-05-08 | 1909-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-11-06 | 1913-05-08 | 1913-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-11-06 | 1917-05-08 | 1917-11-07 | $7700.00 | Window Closed / Lapsed |