Inventor
AMAYA HISASHI
JP24 patents
⚠️ This page may combine multiple inventors who share the name “AMAYA HISASHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SUMITOMO METAL IND
8 patentsUS6210806B1Apr 3, 2001
Martensitic stainless steel having oxide scale layers
SUMITOMO METAL IND44 citations92
US7225868B2Jun 5, 2007
Steel pipe for embedding-expanding, and method of embedding-expanding oil well steel pipe
SUMITOMO METAL IND11 citations84
US7767039B2Aug 3, 2010
Martensitic stainless steel
SUMITOMO METAL IND7 citations74
US6440234B1Aug 27, 2002
Martensitic stainless steel products
SUMITOMO METAL IND12 citations73
US6159311ADec 12, 2000
Martensitic stainless steel pipe and method for manufacturing the same
SUMITOMO METAL IND13 citations73
US7082992B2Aug 1, 2006
Oil well steel pipe for embedding-expanding
SUMITOMO METAL IND3 citations63
US7238434B2Jul 3, 2007
Welded structure having improved resistance to stress corrosion cracking
SUMITOMO METAL IND2 citations62
US7458426B2Dec 2, 2008
Steel pipe for embedding-expanding, and method of embedding-expanding oil well steel pipe
SUMITOMO METAL IND1 citations52
NIPPON STEEL & SUMITOMO METAL CORP
4 patentsUS9322087B2Apr 26, 2016
Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well
NIPPON STEEL & SUMITOMO METAL CORP5 citations71
US9783876B2Oct 10, 2017
Stainless steel for oil wells and stainless steel pipe for oil wells
NIPPON STEEL & SUMITOMO METAL CORP5 citations69
US10995394B2May 4, 2021
Steel bar for downhole member, and downhole member
NIPPON STEEL & SUMITOMO METAL CORP1 citations58
US9555496B2Jan 31, 2017
Process for producing welded joint using GMA welding and CO2 as a shielding gas
NIPPON STEEL & SUMITOMO METAL CORP1 citations49