Patent US3629963A successfully refreshed from Google Patents.
US3629963A
Expired / Lapsed
US
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Apparatus for levelling underwater ground
Assignee: JAPAN CONSTRUCTION AND DEV CO
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Filing: 1969-05-19
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Granted: 1971-12-28
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Expires: 1989-05-19
Abstract
Abstract In an apparatus for levelling underwater ground, an underwater bulldozer is suspended from a ship by means of a cable, and a diver is lowered near the bulldozer to remotely manipulate the bulldozer by operating a control panel carried by him. Electric signals from the control panel are supplied to the bulldozer via an electric cable. The ship is provided with a cavity to accommodate the bulldozer, a winch to raise and lower the bulldozer and retractable bulldozer-supporting means.
Inventors
- 👤 Yasuo Itami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:48
CPC Classifications
B; B63; B63G; B63G8/00; B63G8/001; B63C; B63C1/00; B63C1/12; E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F5/00; E02F5/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
An apparatus for levelling ground under water comprising: a ship (1); An underwater bulldozer (19); a cavity (17) in said ship, said cavity being opened at its bottom to accommodate said underwater bulldozer; a winch (12) on said ship to wind and unwind a ship''s cable (18) connected to said underwater bulldozer (19); supporting means at the bottom of said cavity; means (28, 28'') to operate said supporting means into and out of the operating position in which said supporting means support said bulldozer when it is received in said cavity; a control panel (20) to be carried by a diver; an electric cable (22) interconnecting said control panel and said bulldozer to operate the same by electric signals from said control panel with an airhose (21) provided along said electric cable between said ship and control panel to supply air to said diver; a power unit (11) mounted on said ship to supply power to drive said underwater bulldozer; and, at least one anchoring post (2) and means to raise and lower said anchoring post.
Claim 2
Independent Claim
176 words
An apparatus for levelling ground under water comprising: a ship (1); An underwater bulldozer (19); a cavity (17) in said ship, said cavity being opened at its bottom to accommodate said underwater bulldozer; a winch (12) on said ship to wind and unwind a ship''s cable (18) connected to said underwater bulldozer (19); supporting means at the bottom of said cavity; means (28, 28'') to operate said supporting means into and out of the operating position in which said supporting means support said bulldozer when it is received in said cavity; a control panel (20) to be carried by a diver; an electric cable (22) interconnecting said control panel and said bulldozer to operate the same by electric signals from said control panel with an airhose (21) provided along said electric cable between said ship and control panel to supply air to said diver; a power unit (11) mounted on said ship to supply power to drive said underwater bulldozer; and, at least one anchoring post (2) and means to raise and lower said anchoring post.
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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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |