Patent US2992497A successfully refreshed from Google Patents.
US2992497A
Expired / Lapsed
US
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Hydraulic dredge
Assignee: Construction Aggregates Corp
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Filing: 1959-01-02
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Granted: 1961-07-18
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Expires: 1979-01-02
Abstract
No abstract record available.
Inventors
- 👤 Davis Clyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:58
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/94; B; B02; B02C; B02C1/00; B02C1/02; B02C1/04; E02F7/00; E02F7/06; E02F7/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US966651A
Cited
US1024664A
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US1027095A
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US1633161A
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US2214194A
Cited
US2318039A
Cited
US2500109A
Cited
US2605051A
Cited
US2815771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |