US1821029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway signaling apparatus
Assignee: Hitachi Rail STS USA Inc
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Filing: 1929-10-19
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Granted: 1931-09-01
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Expires: 1949-10-19
Abstract
No abstract record available.
Inventors
- 👤 Peter Bernard Hartley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:42
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/02; B61L3/06; B61L3/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-08-31 | 1935-03-02 | 1935-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-08-31 | 1939-03-02 | 1939-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-08-31 | 1943-03-02 | 1943-09-01 | $7700.00 | Window Closed / Lapsed |