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PCE
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IPC Subgroup
B21H 3/02

external screw-threads

Introduced: September 1968

Last revised: January 2006

Full Title

Making helical bodies or bodies having parts of helical shape > external screw-threads

Classification Context

Section:
PERFORMING OPERATIONS; TRANSPORTING
Class:
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
Subclass:
MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS

Related Keywords

making NUT(S) by rollingTHREADING metal by rolling

2 direct subcodes

Child Classifications

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  • B21H 3/04 Making by means of profiled rolls
  • B21H 3/06 Making by means of profiled members other than rolls, e.g. jaws, moved longitudinally or curvilinearly with respect to each other

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