US2484680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway train communication and alarm system using modulated carrier currents
Assignee: Hitachi Rail STS USA Inc
•
Filing: 1945-01-30
•
Granted: 1949-10-11
•
Expires: 1965-01-30
Abstract
No abstract record available.
Inventors
- 👤 Paul N Bossart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:05
CPC Classifications
B; B61; B61L; B61L23/00; B61L3/00; B61L3/02; B61L3/08; B61L3/12; B61L3/121
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1821758A
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US2124450A
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US2064958A
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US2064639A
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US2064641A
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US2090088A
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US2143563A
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US2176868A
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US2272106A
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US2419593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-10 | 1953-04-11 | 1953-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-10 | 1957-04-11 | 1957-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-10 | 1961-04-11 | 1961-10-11 | $7700.00 | Window Closed / Lapsed |