Inventor

KOCH FRIEDRICH-OTTO

DE6 patents

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

HOESCH WERKE AG

3 patents

US4823847AApr 25, 1989

Multi-layer helical seam steel pipe

HOESCH WERKE AG31 citations87

US4531409AJul 30, 1985

Test system for defect determination in welding seams

HOESCH WERKE AG24 citations80

US4535215AAug 13, 1985

Method and device for controlling the welding process in the manufacturing of pipes with longitudinal seams

HOESCH WERKE AG16 citations68

HOESCH AG

1 patent

US4721536AJan 26, 1988

Method for making steel tubes or pipes of increased acidic gas resistance

HOESCH AG55 citations89

GROSS HEINZ

1 patent

US4688319AAug 25, 1987

Multi-layer helical seam steel pipe

GROSS HEINZ29 citations89

HOECHST AG

1 patent

US4969671ANov 13, 1990

Gas-tight joint for pipe linings and risers

HOECHST AG20 citations76