US2874493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic signal and barrier device for railroad crossings
Assignee: ETHEL SCOTT
•
Filing: 1956-08-31
•
Granted: 1959-02-24
•
Expires: 1976-08-31
Abstract
No abstract record available.
Inventors
- 👤 Mandel Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:29
CPC Classifications
B; B61; B61L; B61L29/00; B61L29/02; B61L29/023; B61L29/04; E; E01; E01F; E01F13/00; E01F13/04; E01F13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US435166A
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US1318309A
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US1388674A
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US1246384A
Cited
US1628651A
Cited
US1706318A
Cited
US1997199A
Cited
US2152276A
Cited
US2711037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |