Patent US2447571A successfully refreshed from Google Patents.
US2447571A
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Ditch paving machine
Assignee: SOUTHWEST PAVING Co
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Filing: 1945-01-20
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Granted: 1948-08-24
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Expires: 1965-01-20
Abstract
No abstract record available.
Inventors
- 👤 Edward D Ekenstam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:23
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/48; E01C19/488; E01C19/4886; E01C19/4893; E02; E02B; E02B5/00; E02B5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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DE420332C
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US2065698A
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US2195015A
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US2169987A
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US2185645A
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US2267022A
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US2271333A
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US2351592A
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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) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |