Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts

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

Additional Content

Bending, e.g. for straightening rails or rail joints Reconditioning of well casings, e.g. straightening

Related Keywords

restoring form or straightening of rods, tubes, profiles or specific articles made therefromSTRAIGHTENING metal sheet, rod, tubing or profiles or articles made therefrom

5 direct subcodes

Child Classifications

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B21D 3/02 by rollers
B21D 3/1 between rams and anvils or abutments
B21D 3/12 by stretching with or without twisting
B21D 3/14 Recontouring
B21D 3/16 of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially-adapted methods or means

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