Inventor

TSUKIYAMA KATSUHIRO

JP2 patents

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

SAGA TEKKOHSHO CO LTD

1 patent

US7976258B2Jul 12, 2011

Screw and screw fastening structure

SAGA TEKKOHSHO CO LTD13 citations72

KOBE STEEL LTD

1 patent

US6605166B2Aug 12, 2003

Method for manufacturing high strength bolt excellent in resistance to delayed fracture and to relaxation

KOBE STEEL LTD11 citations68