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CPC Subgroup
E01B 27/16

Sleeper-tamping machines

Full Title

Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers > Packing sleepers, with or without concurrent work on the track; Compacting track-carrying ballast > Packing sleepers, with or without concurrent work on the track (preforming ballast cores or seats for sleepers E01B27/02) > Sleeper-tamping machines

2 direct subcodes

Child Classifications

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  • E01B 27/17 combined with means for lifting, levelling or slewing the track
  • E01B 27/18 by introducing additional fresh material under the sleepers, e.g. by the measured-shovel method, by the blowing method

Top Applicants

Top 10 applicants by patent filingsfor class E01, 2013–2023, worldwide · Source: EPO PATSTAT

  1. PLASSER & THEURER EXPORT VON BAHNBAUMASCHINEN AT 998
  2. CATERPILLAR PAVING PRODUCTS US 937
  3. CHINA RAILWAY SIYUAN SURVEY AND DESIGN GROUP COMPANY 869
  4. WIRTGEN DE 740
  5. CHINA RAILWAY MAJOR BRIDGE ENGINEERING GROUP COMPANY 685
  6. CHANG AN UNIVERSITY 615
  7. CREEC (CHINA RAILWAY ERYUAN ENGINEERING GROUP) 613
  8. SOUTHEAST UNIVERSITY 562
  9. TONGJI UNIVERSITY 500
  10. ROAD & BRIDGE INTERNATIONAL COMPANY 491