Inventor

OKAMOTO RIKI

JP55 patents

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

OKAMOTO RIKI

NIPPON STEEL CORP

High-strength steel sheet highly resistant to dynamic deformation and excellent in workability and process for the production thereof

High-strength steel plate having high dynamic deformation resistance and method of manufacturing the same

Cold-rolled steel sheet having a tensile strength of 780 MPA or more, an excellent local formability and a suppressed increase in weld hardness

Steel sheet and manufacturing method of therefor

Steel sheet and manufacturing method therefor

High-strength hot-rolled steel shaft excellent in hole expandability and ductility and production method thereof

High strength thin steel excellent in hole expansibility, ductility and chemical treatment characteristics

Hot-rolled steel sheet

Steel sheet

Method for manufacturing a steel sheet for tin plated steel sheet and tin-free steel sheet each having excellent formability

Steel sheet for tin plated steel sheet and tin-free steel sheet each having excellent formability and manufacturing method thereof

Method for controlling cooling of steel sheet

Steel sheet and manufacturing method therefor

Steel sheet and method for producing same

Steel sheet

Galvannealed steel sheet

High strength hot rolled steel plate excellent in enlargeability and ductility and method for producing thereof

High-strength hot-rolled steel sheet

Hot rolled steel sheet and method for producing same

Hot rolled steel sheet and method for producing same

Cold-rolled steel sheet and hot-dip galvanized cold-rolled steel sheet

NIPPON STEEL & SUMITOMO METAL CORP

High-strength cold-rolled steel sheet, high-strength hot-dip galvanized steel sheet and high-strength galvannealed steel sheet

Hot-rolled steel sheet and method for producing same

High-strength cold-rolled steel sheet having excellent uniform elongation and hole expandability

Hot-rolled steel sheet for gas nitrocarburizing and manufacturing method thereof

Hot-rolled steel sheet, cold-rolled steel sheet, galvanized steel sheet, and methods of manufacturing the same

High-strength cold-rolled steel sheet having excellent local deformability

Burring processing method

Steel sheet

Bainite-containing-type high-strength hot-rolled steel sheet having excellent isotropic workability and manufacturing method thereof

High-strength low-specific-gravity steel sheet having superior spot weldability

Method for producing a cold-rolled steel sheet

High-strength steel sheet and method of manufacturing the same

Galvannealed steel sheet and method for producing the same

Method of manufacturing press-formed product, and press-formed product

YOKOI TATSUO

Hot-rolled steel sheet and method of producing the same

Hot-rolled steel sheet for gas nitrocarburizing and manufacturing method thereof

Bainite-containing-type high-strength hot-rolled steel sheet having excellent isotropic workability and manufacturing method thereof

OKAMOTO RIKI

Steel sheet and method of manufacturing steel sheet

High-strength steel sheets excellent in hole-expandability and ductility

High-strength steel sheets excellent in hole-expandability and ductility

SANO KOHICHI

High-strength cold-rolled steel sheet and method of manufacturing thereof

Hot-rolled steel sheet and method for producing same

SUWA YOSHIHIRO

High-strength hot-rolled steel sheet having excellent local deformability and manufacturing method thereof

Manufacturing method of a high-strength cold-rolled steel sheet having excellent local deformability

TODA YURI

Cold-rolled steel sheet

Manufacturing method of a high-strength cold-rolled steel sheet having excellent uniform elongation and hole expandability

NOZAKI TAKAYUKI

Hot-rolled steel sheet and production method thereof

FUJITA NOBUHIRO

Hot-rolled steel sheet, cold-rolled steel sheet, galvanized steel sheet, and methods of manufacturing the same

SHUTO HIROSHI

High-strength cold-rolled steel sheet having excellent stretch flangeability and precision punchability and manufacturing method thereof