Patent US3618236A successfully refreshed from Google Patents.
US3618236A
Expired / Lapsed
US
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Apparatus for digging an underwater trench
Assignee: Individual
•
Filing: 1969-05-19
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Granted: 1971-11-09
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Expires: 1989-05-19
Abstract
Abstract THE COMBINATION OF A TOWING SHIP AND A TOWED UNDERWATER TRENCH DIGGING APPARATUS, AND A SUCTION AND DISCHANGE MECHANISM MOUNTED ON SAID TOWED DIGGING APPARATUS FOR SUCKING UP AND DISCHARGING THE DEBRIS OF DIGGING TO ONE SIDE OF A TRENCH AS IT IS DUG, AND THE METHOD OF REMOVAL OF DIGGING DEBRIS IN UNDERWATER TRENCH DIGGING WITH APPROXIMATELY LITTLE OR NO DISCHARGE CONDUIT FOR ANY DEPTH OF WATER.
Inventors
- 👤 James D Pipkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:07
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/10; E02F5/104; E02F5/107; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F5/108
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |