US2814387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ballast cleaning machine
Assignee: RAILWAY MAINTENANCE CORP
•
Filing: 1952-04-21
•
Granted: 1957-11-26
•
Expires: 1972-04-21
Abstract
No abstract record available.
Inventors
- 👤 James B Mcwilliams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:13
CPC Classifications
E; E01; E01B; E01B27/00; E01B27/06; E01B27/10; E01B27/107
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1690009A
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US2300017A
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US2449608A
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US2405622A
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US2511039A
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US2587918A
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US2594666A
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US2708800A
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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) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |