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US2557254A
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US
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Warning signal for railroads
Assignee: Ohio Brass Co
•
Filing: 1946-07-08
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Granted: 1951-06-19
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Expires: 1966-07-08
Abstract
No abstract record available.
Inventors
- 👤 William P Bovard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:41
CPC Classifications
B; B61; B61L; B61L5/00; B61L5/20; B61L5/203
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US983415A
Cited
US1301767A
Cited
GB222976A
Cited
US1505115A
Cited
US2007800A
Cited
US2072503A
Cited
US2306642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |