Inventor
WATANABE TOYOFUMI
JP25 patents
⚠️ This page may combine multiple inventors who share the name “WATANABE TOYOFUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NIPPON KOKAN KK
22 patentsUS5496652AMar 5, 1996
Zinc-plated steel plate having resin coating film
NIPPON KOKAN KK26 citations92
US5387473AFeb 7, 1995
Weldable black steel sheet with low-gloss appearance
NIPPON KOKAN KK51 citations92
US5429880AJul 4, 1995
Organic composite coated steel sheet and a process for manufacturing the same
NIPPON KOKAN KK22 citations90
US5641578AJun 24, 1997
Weldable black steel sheet
NIPPON KOKAN KK13 citations73
US5629099AMay 13, 1997
Alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability and method for manufacturing same
NIPPON KOKAN KK14 citations73
US5494706AFeb 27, 1996
Method for producing zinc coated steel sheet
NIPPON KOKAN KK15 citations73
US5393605AFeb 28, 1995
Zinciferous plated steel sheet excellent in press-formability and corrosion resistance
NIPPON KOKAN KK9 citations73
US5336567AAug 9, 1994
Nickel alloy electroplated cold-rolled steel sheet excellent in press-formability and phosphating-treatability
NIPPON KOKAN KK14 citations73
US5650238AJul 22, 1997
Zinc-electroplated steel sheet
NIPPON KOKAN KK11 citations71
US5500290AMar 19, 1996
Surface treated steel sheet
NIPPON KOKAN KK14 citations71
US5997664ADec 7, 1999
Method for producing galvanized steel sheet
NIPPON KOKAN KK4 citations63
US5609968AMar 11, 1997
Weldable colored steel sheet
NIPPON KOKAN KK5 citations62
US5589279ADec 31, 1996
Weldable black steel sheet
NIPPON KOKAN KK4 citations62
US5556715ASep 17, 1996
Weldable colored steel sheet
NIPPON KOKAN KK5 citations62
US5456816AOct 10, 1995
Nickel alloy electroplated cold-rolled steel sheet excellent in press-formability and phosphating-treatability and method for manufacturing same
NIPPON KOKAN KK4 citations62
US5421988AJun 6, 1995
Method of manufacturing plated steel sheet with Zn-Cr composite plating
NIPPON KOKAN KK3 citations62
US5391290AFeb 21, 1995
Method for continuously tin-electroplating metal strip
NIPPON KOKAN KK6 citations61
US5275716AJan 4, 1994
Method for manufacturing tin-electroplated cold-rolled steel strip
NIPPON KOKAN KK5 citations61
US4898649AFeb 6, 1990
Method for manufacturing electrolytically chromated steel sheet
NIPPON KOKAN KK6 citations61
US5810991ASep 22, 1998
Zinc-electroplated steel sheet and method thereof
NIPPON KOKAN KK4 citations60
US5458764AOct 17, 1995
Method of manufacturing plated steel sheet with zn-cr alloy plating
NIPPON KOKAN KK1 citations51
US4875984AOct 24, 1989
Method for manufacturing electrolytically chromated steel sheet
NIPPON KOKAN KK1 citations50