Riser lifting tool

Handling: hand and hoist-line implements – Grapple

Reexamination Certificate

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Details

C294S082350, C294S103100

Reexamination Certificate

active

07905529

ABSTRACT:
A lifting tool (10) is provided for supporting an oilfield riser during relocation by a crane having a support line (14). The tool body (12) has an inverted U-shaped configuration with a central opening (18) and a downwardly facing throat (20). A powered drive (26) rotates the arcuate member between the open position and the closed position.

REFERENCES:
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patent: 3964777 (1976-06-01), Lindqvist
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patent: 4202653 (1980-05-01), Moller
patent: 4360230 (1982-11-01), Wood et al.
patent: 4808034 (1989-02-01), Birch
patent: 5244243 (1993-09-01), Grayson et al.
patent: 5284374 (1994-02-01), Szkrybalo et al.
patent: 6719497 (2004-04-01), Pollack et al.
patent: 6877281 (2005-04-01), Gavin

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