Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: PERFORMING OPERATIONS; TRANSPORTING
Class:: MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
Subclass:: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL

Related Keywords

FLATTENING metal sheet by straightening, stretching or otherwise removing local distortionsLEVELLING metal sheetrepairing distorted MUD guardsrestoring form of, straightening, or removing local distortions from sheet metal or specific articles made therefromSTRAIGHTENING metal sheet, rod, tubing or profiles or articles made therefromSTRETCHING sheet metal

5 direct subcodes

Child Classifications

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B21D 1/02 by rollers
B21D 1/05 Stretching combined with rolling
B21D 1/06 Removing local distortions
B21D 1/12 Straightening vehicle body parts or bodies
B21D 1/14 Straightening frame structures

Top Applicants

Top 10 applicants by patent filingsfor class B21, 2013–2023, worldwide · Source: EPO PATSTAT

JFE STEEL 2,318
JFE STEEL JP 2,294
POSCO (POHANG IRON AND STEEL COMPANY) KR 2,083
NIPPON STEEL CORPORATION JP 1,650
NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 1,631
SMS GROUP DE 1,472
BAOSHAN IRON & STEEL COMPANY 1,181
SGCC(STATE GRID CORPORATION OF CHINA) 1,079
ANHUI JIANGHUAI AUTOMOBILE 984
HYUNDAI STEEL COMPANY KR 980