IPC Main Group
E02D 29/00 Underground or underwater structures; Retaining walls
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL-SHIFTING
- Subclass:
- FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
Related Keywords
subaqueous BUILDING(S)INSULATION of tunnelssubaqueous STRUCTURESSUBAQUEOUS structuresSUBWAY(S) tunnelsTUNNEL(S) underwaterUNDERGROUND structuresUNDERWATER structuresunderwater or underground WALL(S)
6 direct subcodes
Child Classifications
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- E02D 29/02 Retaining or protecting walls
- E02D 29/045 Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D 29/063 Tunnels submerged into, or built in, open water
- E02D 29/09 Constructions or methods of constructing, in water, not otherwise provided for
- E02D 29/12 Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D 29/16 Arrangement or construction of joints in foundation structures
Top Applicants
Top 10 applicants by patent filingsfor class E02, 2013–2023, worldwide · Source: EPO PATSTAT
- KOMATSU JP 3,549
- CATERPILLAR US 2,893
- HITACHI CONSTRUCTION MACHINERY COMPANY JP 2,390
- HITACHI CONSTRUCTION MACHINERY COMPANY 2,340
- POWERCHINA HUADONG ENGINEERING CORPORATION 2,336
- CHINA CONSTRUCTION EIGHTH ENGINEERING DIVISION 2,174
- SGCC(STATE GRID CORPORATION OF CHINA) 2,119
- HOHAI UNIVERSITY 1,821
- KOMATSU 1,775
- POWERCHINA GUIYANG ENGINEERING CORPORATION 1,725