F02G HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
Description
F02G covers positive-displacement engines powered by hot gases or combustion products, including Stirling engines, Ericsson engines, and related thermodynamic cycles that operate by expanding heated working fluids rather than traditional combustion-driven piston mechanisms. This subclass also encompasses systems for capturing and utilizing waste heat from combustion engines where such applications are not specifically covered elsewhere in the classification scheme. Technologies include heat exchangers, regenerators, and energy recovery systems integrated with engine plants. Adjacent classes F02B–F02F address conventional internal combustion engines, while F02G specifically focuses on alternative thermal cycles and waste-heat utilization not classified in specialized engine or heating sections.
19 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- F02G 1/00 Hot gas positive-displacement engine plants
- F02G 2242/00 Ericsson-type engines having open regenerative cycles controlled by valves
- F02G 2243/00 Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes
- F02G 2244/00 Machines having two pistons
- F02G 2250/00 Special cycles or special engines
- F02G 2253/00 Seals
- F02G 2254/00 Heat inputs
- F02G 2255/00 Heater tubes
- F02G 2256/00 Coolers
- F02G 2257/00 Regenerators
- F02G 2258/00 Materials used
- F02G 2260/00 Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits
- F02G 2262/00 Recuperating heat from exhaust gases of combustion engines and heat from lubrication circuits
- F02G 2270/00 Constructional features
- F02G 2275/00 Controls
- F02G 2280/00 Output delivery
- F02G 2290/00 Engines characterised by the use of a particular power transfer medium, e.g. Helium
- F02G 3/00 Combustion-product positive-displacement engine plants
- F02G 5/00 Profiting from waste heat of combustion engines, not otherwise provided for
Top Applicants
Top 10 applicants by patent filingsfor class F02, 2013–2023, worldwide · Source: EPO PATSTAT
- ROBERT BOSCH DE 8,801
- FORD GLOBAL TECHNOLOGIES US 8,171
- GE (GENERAL ELECTRIC COMPANY) US 6,957
- HYUNDAI MOTOR COMPANY KR 5,390
- UNITED TECHNOLOGIES CORPORATION (UTC) US 5,250
- TOYOTA MOTOR CORPORATION JP 5,214
- TOYOTA MOTOR CORPORATION 4,149
- DENSO CORPORATION JP 3,400
- KIA MOTORS CORPORATION KR 3,388
- SAFRAN AIRCRAFT ENGINES FR 3,332