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US2554056A
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Multiple frequency intermittent inductive cab signal and automatic train control system
Assignee: Hitachi Rail STS USA Inc
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Filing: 1947-06-20
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Granted: 1951-05-22
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Expires: 1967-06-20
Abstract
No abstract record available.
Inventors
- 👤 Peter Leslie Hurst
- 👤 Shipp Douglas Goldie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:57
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/02; B61L3/08; B61L3/12; B61L3/121
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19633E
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US1710499A
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DE340955C
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US1964819A
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US1742617A
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US1773297A
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US2098719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |