Patent US2425857A successfully refreshed from Google Patents.
US2425857A
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US
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Apparatus for detecting flaws in rails
Assignee: Individual
•
Filing: 1943-09-24
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Granted: 1947-08-19
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Expires: 1963-09-24
Abstract
No abstract record available.
Inventors
- 👤 Walter C Barnes
- 👤 Henry W Keevil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:53
CPC Classifications
B; B61; B61K; B61K9/00; B61K9/08; B61K9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1628618A
Cited
GB419110A
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US2317718A
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US2210770A
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US2216600A
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US2207392A
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US2306584A
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US2355940A
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US2363336A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |