US2465691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Track circuit apparatus
Assignee: Hitachi Rail STS USA Inc
•
Filing: 1945-12-12
•
Granted: 1949-03-29
•
Expires: 1965-12-12
Abstract
No abstract record available.
Inventors
- 👤 Paul N Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:54
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/08; B61L23/14; B61L23/16; B61L23/168
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1921786A
Cited
US2001047A
Cited
US2045992A
Cited
US2155343A
Cited
US2123966A
Cited
US2303786A
Cited
US2328241A
Cited
US2332279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-28 | 1952-09-27 | 1953-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-28 | 1956-09-27 | 1957-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-28 | 1960-09-27 | 1961-03-29 | $7700.00 | Window Closed / Lapsed |