Lift boat

Ships – Floating platform – Multiple leg

Reexamination Certificate

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Details

C405S196000, C405S203000

Reexamination Certificate

active

07131388

ABSTRACT:
An improved lift boat includes a hull, a plurality of legs (preferably three), a plurality of pads, one pad attached to each leg, and a jacking mechanism for moving each upward and downward. Recesses in the hull receive the pads when the lift boat is underway. Preferably, the total bottom surface area of the pads is at least 30% of the surface area of the deck of the lift boat Preferably, the total bottom surface area of the pads is large enough such that, when the boat is loaded to capacity and is jacked up, the pads exert pressure of less than 7 p.s.i. on the sea floor. Preferably, the pads are partially recessed into the hull and extend laterally outward from the hull when the boat is underway to provide increased stability to the lift boat when it is underway.

REFERENCES:
patent: 2308743 (1943-01-01), Bulkley et al.
patent: 2334992 (1943-11-01), Crake
patent: 2927436 (1960-03-01), Besse
patent: 2942425 (1960-06-01), De Long et al.
patent: 3628336 (1971-12-01), Moore et al.
patent: 3727414 (1973-04-01), Davies
patent: 3872679 (1975-03-01), Fischer
patent: 4112863 (1978-09-01), Nelson
patent: 4254730 (1981-03-01), Crenshaw
patent: 4325654 (1982-04-01), Meckler
patent: 4455109 (1984-06-01), Lorenz
patent: 4483644 (1984-11-01), Johnson
patent: 4652177 (1987-03-01), Gunther, Jr. et al.
patent: 4846357 (1989-07-01), Sholl et al.
patent: 5188484 (1993-02-01), White
patent: 5190410 (1993-03-01), Nunley
patent: 5855455 (1999-01-01), Williford et al.
patent: 1.419.936 (1964-11-01), None

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