US1820170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the control of highway crossing signals
Assignee: Hitachi Rail STS USA Inc
•
Filing: 1930-09-10
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Granted: 1931-08-25
•
Expires: 1950-09-10
Abstract
No abstract record available.
Inventors
- 👤 Paul F Willard
- 👤 George R Pflasterer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:53
CPC Classifications
B; B61; B61L; B61L29/00; B61L29/24; B61L29/28; B61L29/288
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) | 1934-08-24 | 1935-02-23 | 1935-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-08-24 | 1939-02-23 | 1939-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-08-24 | 1943-02-23 | 1943-08-25 | $7700.00 | Window Closed / Lapsed |