Patent US2889642A successfully refreshed from Google Patents.
US2889642A
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Clam shell dredging device
Assignee: Individual
•
Filing: 1956-03-01
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Granted: 1959-06-09
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Expires: 1976-03-01
Abstract
No abstract record available.
Inventors
- 👤 Richard C Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:58
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/92; E02F3/9256; B; B66; B66C; B66C3/00; B66C3/14; B66C3/16; E02F3/28; E02F3/36; E02F3/40; E02F3/413; E02F3/4131; E02F3/9293; E02F5/00; E02F5/28; E02F5/285
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |