Inventor
HIRANO OSAMU
JP7 patents
⚠️ This page may combine multiple inventors who share the name “HIRANO OSAMU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NIPPON KOKAN KK
6 patentsUS4320277AMar 16, 1982
Thick welded steel pipe of large diameter and production thereof
NIPPON KOKAN KK21 citations78
US4341938AJul 27, 1982
Method and apparatus for seam-welding steel pipes
NIPPON KOKAN KK16 citations71
US4107503AAug 15, 1978
Method for eliminating residual magnetism in pipe-blank for welded steel pipe longitudinally seam-welded from inside
NIPPON KOKAN KK10 citations71
US4238659ADec 9, 1980
Preventing magnetization of pipe blank in GMA welding
NIPPON KOKAN KK4 citations60
US4110589AAug 29, 1978
Method for longitudinally seam-welding pipe-blank for welded steel pipe from the inside along a groove
NIPPON KOKAN KK2 citations60
US5397654AMar 14, 1995
Abrasion-resistant welded steel pipe
NIPPON KOKAN KK5 citations59