US2507728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inductive communication system between moving vehicles and conventional telephone subscribers
Assignee: Hitachi Rail STS USA Inc
•
Filing: 1948-08-24
•
Granted: 1950-05-16
•
Expires: 1968-08-24
Abstract
No abstract record available.
Inventors
- 👤 Elbert W Marlowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:39
CPC Classifications
H; H04; H04B; H04B5/00; B; B61; B61L; B61L15/00; B61L15/0018; B61L15/0036
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1448523A
Cited
US2393291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-15 | 1953-11-14 | 1954-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-15 | 1957-11-14 | 1958-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-15 | 1961-11-14 | 1962-05-16 | $7700.00 | Window Closed / Lapsed |