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Inventor

WALKER JOHN H

US9 patents
⚠️ This page may combine multiple inventors who share the name “WALKER JOHN H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

PHILLIPS PETROLEUM CO

5 patents
US4708203ANov 24, 1987

Composite drill collar

PHILLIPS PETROLEUM CO22 citations80
US5009826AApr 23, 1991

Method of molding a composite drill collar

PHILLIPS PETROLEUM CO13 citations72
US4544701AOct 1, 1985

Stamp molded paraffin scraper

PHILLIPS PETROLEUM CO7 citations65
US4832137AMay 23, 1989

Method for protecting a pipe casing from a drill pipe string

PHILLIPS PETROLEUM CO2 citations61
US4009295AFeb 22, 1977

Printable anti-blocking resinous block copolymer

PHILLIPS PETROLEUM CO2 citations61

DOWTY MINING EQUIPMENT LTD

2 patents
US4132081AJan 2, 1979

Mine roof support

DOWTY MINING EQUIPMENT LTD6 citations62
US4126002ANov 21, 1978

Mine roof support

DOWTY MINING EQUIPMENT LTD0 citations51

DEMPSTER IND INC

1 patent
US4212428AJul 15, 1980

Hydraulic power and control system for granular fertilizer spreaders

DEMPSTER IND INC47 citations90

(unassigned)

1 patent
US5555853ASep 17, 1996

Lightweight back-pack generator set having a spark-ignited engine operating on middle distillate fuels

32 citations85