Patent US1393701A successfully refreshed from Google Patents.
US1393701A
Expired / Lapsed
US
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Safety electric signal for railways
Assignee: ALEXANDRO ANGULO
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Filing: 1919-11-15
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Granted: 1921-10-11
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Expires: 1939-11-15
Abstract
No abstract record available.
Inventors
- 👤 Sanchez Leonardo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:18
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/221
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) | 1924-10-10 | 1925-04-11 | 1925-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-10-10 | 1929-04-11 | 1929-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-10-10 | 1933-04-11 | 1933-10-11 | $7700.00 | Window Closed / Lapsed |