IPC Main Group
B61C 15/00 Maintaining or augmenting the starting or braking power by auxiliary devices and measures; Preventing wheel slippage; Controlling distribution of tractive effort between driving wheels
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- PERFORMING OPERATIONS; TRANSPORTING
- Class:
- RAILWAYS
- Subclass:
- LOCOMOTIVES; MOTOR RAILCARS
Related Keywords
preventing SLIPPING on railspreventing slipping of VEHICLES on rails
4 direct subcodes
Child Classifications
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- B61C 15/02 by auxiliary driving wheels; by temporary coupling or use of flywheels or booster engines
- B61C 15/04 by controlling wheel pressure, e.g. by movable weights or heavy parts or by magnetic devices
- B61C 15/08 Preventing wheel slippage
- B61C 15/14 controlling distribution of tractive effort between driving wheels
Top Applicants
Top 10 applicants by patent filingsfor class B61, 2013–2023, worldwide · Source: EPO PATSTAT
- SIEMENS MOBILITY DE 2,749
- CRRC QINGDAO SIFANG COMPANY 2,215
- SIEMENS DE 1,941
- ALSTOM TRANSPORT TECHNOLOGIES FR 1,514
- BYD COMPANY 1,371
- CRRC CHANGCHUN RAILWAY VEHICLES COMPANY 1,205
- CRRC ZHUZHOU LOCOMOTIVE COMPANY 1,165
- CRRC TANGSHAN COMPANY 1,119
- BOMBARDIER TRANSPORTATION DE 1,001
- SOUTHWEST JIAOTONG UNIVERSITY 958