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US1526130A
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US
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Method and system for indicating or controlling train spacing
Assignee: Individual
•
Filing: 1922-05-19
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Granted: 1925-02-10
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Expires: 1942-05-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Gardiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:03
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/16; B61L3/22; B61L3/221
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) | 1928-02-10 | 1928-08-11 | 1929-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-02-10 | 1932-08-11 | 1933-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-02-10 | 1936-08-11 | 1937-02-10 | $7700.00 | Window Closed / Lapsed |