F04B POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
Introduced: September 1968
Description
F04B covers positive-displacement pumps and machines designed to move liquids by repeatedly expanding and contracting sealed volumes, forcing fluid through the system with each cycle. This subclass encompasses reciprocating pumps (piston and plunger types), rotary pumps (gear, screw, and vane designs), and diaphragm pumps, along with their essential components such as valves, actuators, and control systems. Applications include industrial fluid transfer, hydraulic systems, chemical processing, and fuel injection systems where consistent volumetric displacement and high-pressure capability are required. Excluded are dynamic (centrifugal) pumps, pumps for elastic fluids covered under F04C, and non-positive-displacement machines.
Title
Titles differ between systems:
IPC: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
CPC: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
Full Title
Full titles differ between systems:
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
Additional Content IPC
Limiting references
Machines for liquids, or pumps, of rotary-piston or oscillating-piston type Non-positive-displacement pumps Pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped
Application references
Engine fuel-injection pumps
Of 30 combined children, 25 exist in both systems.
5 codes are CPC-only extensions.
Note: 4 CPC extensions are marked as secondary classification only.
14 shared codes have differing titles between IPC and CPC.
Child Classifications
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- F04B 1/00 Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (machines or pumps with pistons coacting within one cylinder F04B3/00) +1 CPC IPC+CPC Available in IPC and CPC
- F04B 11/00 Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation +4 CPC IPC+CPC Available in IPC and CPC
- F04B 13/00 Pumps specially modified to deliver fixed or variable measured quantities IPC+CPC Available in IPC and CPC
- F04B 15/00 Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts IPC+CPC Available in IPC and CPC
- F04B 17/00 Pumps characterised by combination with, or adaptation to, specific driving engines or motors +2 CPC IPC+CPC Available in IPC and CPC
- F04B 19/00 Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 +2 CPC IPC+CPC Available in IPC and CPC
- F04B 23/00 Pumping installations or systems (pumps characterised by combination with, or adaptation to, specific driving engines or motors F04B17/00) IPC+CPC Available in IPC and CPC
- F04B 27/00 Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders (multi-stage pumps specially adapted for elastic fluids F04B25/00) +1 CPC IPC+CPC Available in IPC and CPC
- F04B 3/00 Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage +1 CPC IPC+CPC Available in IPC and CPC
- F04B 31/00 Free-piston pumps specially adapted for elastic fluids; Systems incorporating such pumps (muscle-driven pumps in which the stroke is not defined by gearing F04B33/00) IPC+CPC Available in IPC and CPC
- F04B 33/00 Pumps actuated by muscle power, e.g. for inflating +1 CPC IPC+CPC Available in IPC and CPC
- F04B 35/00 Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for +4 CPC −1 IPC IPC+CPC Available in IPC and CPC
- F04B 37/00 Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 IPC+CPC Available in IPC and CPC
- F04B 39/00 Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 +3 CPC IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class F04,2013–2023, worldwide · Source: EPO PATSTAT
- GREE ELECTRIC APPLIANCES 5,351
- LG ELECTRONICS KR 3,502
- ROBERT BOSCH DE 3,011
- MIDEA 2,258
- MITSUBISHI ELECTRIC CORPORATION JP 1,663
- ZHUHAI LANDA COMPRESSOR COMPANY 1,639
- GREE ELECTRIC APPLIANCES, INC.OF ZHUHAI 1,573
- ZHUHAI GREE ENERGY-SAVING REFRIGERATION TECHNOLOGY RESEARCH CENTER COMPANY 1,536
- TOYOTA INDUSTRIES CORPORATION 1,347
- DAIKIN INDUSTRIES 1,325
Top Applicants (CPC)
Class F04,2013–2023, worldwide · Source: EPO PATSTAT
- LG ELECTRONICS KR 3,855
- ROBERT BOSCH DE 3,549
- GREE ELECTRIC APPLIANCES 2,273
- GE (GENERAL ELECTRIC COMPANY) US 2,126
- MITSUBISHI ELECTRIC CORPORATION JP 1,881
- UNITED TECHNOLOGIES CORPORATION (UTC) US 1,866
- SAFRAN AIRCRAFT ENGINES FR 1,499
- MITSUBISHI HEAVY INDUSTRIES JP 1,258
- TOYOTA INDUSTRIES CORPORATION JP 1,247
- ATLAS COPCO AIRPOWER BE 1,168