US2486271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Train control system
Assignee: NAT SAFETY APPLIANCE CO Ltd
•
Filing: 1947-03-10
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Granted: 1949-10-25
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Expires: 1967-03-10
Abstract
No abstract record available.
Inventors
- 👤 Herbert P Folker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:03
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/02; B61L3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1598994A
Cited
US1685840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |