Patent US821801A successfully refreshed from Google Patents.
US821801A
Expired / Lapsed
US
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Electric railroad signaling device.
Assignee: Individual
•
Filing: 1905-05-02
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Granted: 1906-05-29
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Expires: 1925-05-02
Abstract
No abstract record available.
Inventors
- 👤 Henry A Hoeschen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:47
CPC Classifications
B; B61; B61L; B61L1/00; B61L1/02; B61L1/06
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) | 1909-05-28 | 1909-11-27 | 1910-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1913-05-28 | 1913-11-27 | 1914-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1917-05-28 | 1917-11-27 | 1918-05-29 | $7700.00 | Window Closed / Lapsed |