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Patent US2475146A successfully refreshed from Google Patents.
US2475146A
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Subsurface ripper
Assignee: Keppel LeTourneau USA Inc
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Filing: 1946-12-14
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Granted: 1949-07-05
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Expires: 1966-12-14
Abstract
No abstract record available.
Inventors
- 👤 Tourneau Robert Gilmore Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:43
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/30; E02F5/32; E01; E01C; E01C23/00; E01C23/06; E01C23/12; E01C23/121
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1530779A
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US1598864A
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US1721761A
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US1844124A
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US2128602A
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US2189072A
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US2302614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |