Patent US2503671A successfully refreshed from Google Patents.
US2503671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous inductive train control
Assignee: —
•
Filing: —
•
Granted: 1950-04-11
•
Expires: 1967-04-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:32
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/221; B61L1/00; B61L1/18; B61L1/181
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1626928A
Cited
US1590839A
Cited
US1824605A
Cited
US1791780A
Cited
US1933680A
Cited
US1912923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |