F04B POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
Introduced: September 1968
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- Subclass:
- POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
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.
Additional Content
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
25 direct subcodes
Child Classifications
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- F04B 1/00 Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B 11/00 Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B 13/00 Pumps specially modified to deliver fixed or variable measured quantities
- F04B 15/00 Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B 17/00 Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B 19/00 Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups
- F04B 23/00 Pumping installations or systems
- F04B 25/00 Multi-stage pumps specially adapted for elastic fluids
- F04B 27/00 Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B 3/00 Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage
- F04B 31/00 Free-piston pumps specially adapted for elastic fluids; Systems incorporating such pumps
- F04B 33/00 Pumps specially adapted for elastic fluids actuated by muscle power, e.g. for inflating
- 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
- F04B 37/00 Pumps specially adapted for elastic fluids and having pertinent characteristics not provided for in, or of interest apart from, groups
- 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
- F04B 41/00 Pumping installations or systems specially adapted for elastic fluids
- F04B 43/00 Machines, pumps, or pumping installations having flexible working members
- F04B 45/00 Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B 47/00 Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B 49/00 Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups
Top Applicants
Top 10 applicants by patent filingsfor 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