B61L 23/18 specially adapted for changing lengths of track sections in dependence upon speed and traffic density
Introduced: September 1968
Title
Titles differ between systems:
IPC: specially adapted for maintaining a safe distance between vehicles or trains depending upon speed and traffic density
CPC: specially adapted for changing lengths of track sections in dependence upon speed and traffic density
Full Title
Full titles differ between systems:
Control, warning or like safety means along the route or between vehicles or trains > for controlling traffic in one direction only > automatically operated > specially adapted for maintaining a safe distance between vehicles or trains depending upon speed and traffic density
Control, warning or like safety means along the route or between vehicles or trains > for controlling traffic in one direction only > automatically operated > specially adapted for changing lengths of track sections in dependence upon speed and traffic density
No child classifications to compare. This is a leaf node in both IPC and CPC.
Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
Class B61,2013–2023, worldwide · Source: EPO PATSTAT
- SIEMENS MOBILITY DE 2,967
- SIEMENS DE 2,133
- ALSTOM TRANSPORT TECHNOLOGIES FR 1,691
- CRRC QINGDAO SIFANG COMPANY 1,100
- BOMBARDIER TRANSPORTATION DE 1,085
- MITSUBISHI ELECTRIC CORPORATION JP 880
- BYD COMPANY 821
- KRRI KR 761
- HITACHI JP 752
- CRRC ZHUZHOU LOCOMOTIVE COMPANY 721