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Inventor

WITTMAN ROBERT H

US8 patents
⚠️ This page may combine multiple inventors who share the name “WITTMAN ROBERT H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HUGHES TOOL CO

3 patents
US4465104AAug 14, 1984

Pressure energized pipeline plug

HUGHES TOOL CO92 citations93
US4422477ADec 27, 1983

Pressure energized pipeline plug

HUGHES TOOL CO87 citations93
US4477105AOct 16, 1984

Collet actuated ball and socket connector

HUGHES TOOL CO40 citations90

EXXON RESEARCH ENGINEERING CO

2 patents
US4046301ASep 6, 1977

Process for explosively joining two pipe sections

EXXON RESEARCH ENGINEERING CO5 citations61
US3987952AOct 26, 1976

Apparatus for explosive welding of hollow cylinders such as pipe

EXXON RESEARCH ENGINEERING CO5 citations61

HUGHES UNDERSEA COUPLING INC

1 patent
US4332277AJun 1, 1982

Pipeline pigging plug

HUGHES UNDERSEA COUPLING INC75 citations91

HYDROTECH INT INC

1 patent
US4078832AMar 14, 1978

Pipe coupling with improved seal means

HYDROTECH INT INC33 citations91

SMID JOHN P

1 patent
US10288065B1May 14, 2019

Mud motor coupling system

SMID JOHN P18 citations77