Patent US2921390A successfully refreshed from Google Patents.
US2921390A
Expired / Lapsed
US
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Ballast plow for use under railway tracks
Assignee: Mannix Co Ltd
•
Filing: 1954-10-07
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Granted: 1960-01-19
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Expires: 1974-10-07
Abstract
No abstract record available.
Inventors
- 👤 Jack C Stein
- 👤 Louis B Franco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:37
CPC Classifications
E; E01; E01B; E01B27/00; E01B27/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US904106A
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US1329543A
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US1718550A
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FR712709A
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FR748676A
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US2437059A
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US2571183A
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US2725016A
Cited
US2769172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |