Patent US1994589A successfully refreshed from Google Patents.
US1994589A
Expired / Lapsed
US
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Ground detecting apparatus
Assignee: Hitachi Rail STS USA Inc
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Filing: 1932-06-02
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Granted: 1935-03-19
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Expires: 1952-06-02
Abstract
No abstract record available.
Inventors
- 👤 Bernard E O'hagan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:25
CPC Classifications
B; B61; B61L; B61L7/00; B61L7/06; B61L7/068
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) | 1938-03-18 | 1938-09-17 | 1939-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-18 | 1942-09-17 | 1943-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-18 | 1946-09-17 | 1947-03-19 | $7700.00 | Window Closed / Lapsed |