US2842292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicating means for rail flaw detecting apparatus
Assignee: Individual
•
Filing: 1954-04-05
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Granted: 1958-07-08
•
Expires: 1974-04-05
Abstract
No abstract record available.
Inventors
- 👤 David C Bettison
- 👤 Frank H Keaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:10
CPC Classifications
B; B61; B61K; B61K9/00; B61K9/08; B61K9/10; E; E01; E01B; E01B31/00; E01B31/02; E01B31/18; G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/83
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US44873A
Cited
USRE23830E
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US1892826A
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US2103851A
Cited
US2526735A
Cited
US2682442A
Cited
US2623766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |