E21F 11/00 Rescue devices or other safety devices, e.g. safety chambers or escape ways (breathing aids for curative purposes A61H31/00; respiratory apparatus A62B7/00; breathing apparatus for accidentally buried persons A62B33/00)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Rescue devices or other safety devices, e.g. safety chambers or escape ways
CPC: Rescue devices or other safety devices, e.g. safety chambers or escape ways (breathing aids for curative purposes A61H31/00; respiratory apparatus A62B7/00; breathing apparatus for accidentally buried persons A62B33/00)
Full Title
Full titles differ between systems:
Rescue devices or other safety devices, e.g. safety chambers or escape ways
Rescue devices or other safety devices, e.g. safety chambers or escape ways (breathing aids for curative purposes A61H31/00; respiratory apparatus A62B7/00; breathing apparatus for accidentally buried persons A62B33/00)
No child classifications to compare. This is a leaf node in both IPC and CPC.
Top Applicants
Top Applicants (IPC)
Class E21,2013–2023, worldwide · Source: EPO PATSTAT
- HALLIBURTON ENERGY SERVICES GROUP US 26,607
- PETROCHINA COMPANY 14,382
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,137
- CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 6,517
- BAKER HUGHES US 6,269
- SCHLUMBERGER TECHNOLOGY US 5,929
- SAUDI ARABIAN OIL COMPANY SA 5,880
- SOUTHWEST PETROLEUM UNIVERSITY 4,477
- CHINA UNIVERSITY OF MINING AND TECHNOLOGY 4,357
- SCHLUMBERGER TECHNOLOGY NL 4,219
Top Applicants (CPC)
Class E21,2013–2023, worldwide · Source: EPO PATSTAT
- HALLIBURTON ENERGY SERVICES GROUP US 27,652
- SAUDI ARABIAN OIL COMPANY SA 7,755
- PETROCHINA COMPANY 7,025
- BAKER HUGHES US 6,589
- SCHLUMBERGER TECHNOLOGY US 6,151
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 4,443
- SCHLUMBERGER TECHNOLOGY NL 4,255
- CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 3,991
- SERVICES PETROLIERS SCHLUMBERGER FR 3,300
- SCHLUMBERGER CANADA CA 3,086