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Inventor

LEGGETT HENRY H

SG11 patents
⚠️ This page may combine multiple inventors who share the name “LEGGETT HENRY H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

EASTERN OIL TOOLS PTE LTD

5 patents
US5287879AFeb 22, 1994

Hydraulically energized wireline blowout preventer

EASTERN OIL TOOLS PTE LTD76 citations93
US4938290AJul 3, 1990

Wireline blowout preventer having mechanical and hydraulic sealing

EASTERN OIL TOOLS PTE LTD60 citations92
US4886115ADec 12, 1989

Wireline safety mechanism for wireline tools

EASTERN OIL TOOLS PTE LTD65 citations92
US4828023AMay 9, 1989

Mechanical latching device operated by dead weight and tension

EASTERN OIL TOOLS PTE LTD17 citations72
US4883119ANov 28, 1989

Mechanical latching device operated by dead weight and tension

EASTERN OIL TOOLS PTE LTD4 citations61

EASTERN OIL TOLLS PTE LTD

1 patent
US4846272AJul 11, 1989

Downhole shuttle valve for wells

EASTERN OIL TOLLS PTE LTD46 citations89

TUBOSCOPE I P

1 patent
US6394460B1May 28, 2002

One-piece ram element block for wireline blowout preventers

TUBOSCOPE I P31 citations86

NAT OILWELL VARCO LP

1 patent
US10030482B2Jul 24, 2018

Valve mechanism having tool trap

NAT OILWELL VARCO LP2 citations72

SCHLUMBERGER TECHNOLOGY CORP

1 patent
US5662312ASep 2, 1997

Pressurized sheave mechanism for high pressure wireline service

SCHLUMBERGER TECHNOLOGY CORP7 citations72

LEGGETT HENRY H

1 patent
US4687055AAug 18, 1987

Wire-line controlled down-hole shut-in tool for wells

LEGGETT HENRY H18 citations69

HYDROLEX INC

1 patent
US6145807ANov 14, 2000

By-pass stud with integral safety valve

HYDROLEX INC2 citations52