F04F PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
Introduced: September 1968
Last revised: July 1974
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- Subclass:
- PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
Description
F04F covers fluid pumping mechanisms that operate without conventional rotating impellers or reciprocating pistons. This subclass encompasses jet pumps (eductor pumps) where a high-velocity motive fluid entrains and accelerates the fluid being pumped, ram pumps and hydraulic rams that exploit fluid inertia for intermittent delivery, and siphon systems that utilize gravity and atmospheric pressure differentials. Also included are airlift pumps that use injected gas bubbles to reduce fluid density in a column, enabling upward flow. These technologies are distinct from traditional positive-displacement and centrifugal pump designs, finding application in low-speed transfer, priming operations, and environments where mechanical moving parts are impractical or undesired.
Related Keywords
8 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- F04F 1/00 Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
- F04F 10/00 Siphons
- F04F 13/00 Pressure exchangers
- F04F 3/00 Pumps using negative pressure acting directly on the liquid to be pumped
- F04F 5/00 Jet pumps, i.e. devices in which fluid flow is induced by pressure drop caused by velocity of another fluid flow
- F04F 7/00 Pumps displacing fluids by using inertia thereof, e.g. by generating vibrations therein
- F04F 9/00 Diffusion pumps
- F04F 99/00 Subject matter not provided for in other groups of this subclass
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