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IPC Main Group
B21D 39/00

Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders

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

Filing statistics

IPC B21D 39/00 belongs to the parent subclass B21D, which recorded 351,007 patent applications worldwide between 2013 and 2023. Annual filings grew from 16,565 in 2013 to 42,835 in 2023 (+159%), peaking at 47,343 applications in 2020. The most active applicants in class B21 are JFE STEEL (2,318 applications), JFE STEEL (2,294 applications) and POSCO (POHANG IRON AND STEEL COMPANY) (2,083 applications).

Source: EPO PATSTAT, worldwide filings

Additional Content

Joining sub-units or components to body shell or other sub-units or components of motor vehicles or trailers Connecting or fastening roof covering slabs or stiff sheets by permanent deformation of, or by forcing together, the marginal portions of adjacent slabs or sheets, e.g. by folding the edges , Apparatus for working, e.g. connecting, roof coverings comprising slabs, sheets or flexible material Methods or apparatus for setting of, e.g. expandable, casings, screens or liners in wells Apparatus or processes specially adapted for forming connections of electric conductors by deformation, e.g. crimping tools

Related Keywords

ASSEMBLING of sheet metal or tubes to objects in general, by metal workingCOATING object with sheet metal other than by plating or weldingEND-CAPS for rods or tubesEXPANDING of tubesJOINING metal parts together by bending, folding, punching or squirtingassembling components to form METAL(S) articlesjoining, connecting or uniting METAL(S) parts or objectsfixing PIPE(S) to walls or supports

5 direct subcodes

Child Classifications

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  • B21D 39/02 of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
  • B21D 39/03 of sheet metal otherwise than by folding
  • B21D 39/04 of tubes with tubes; of tubes with rods
  • B21D 39/06 of tubes in openings, e.g. rolling-in

Top Applicants

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

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