| Share of applications |
IPC group |
IPC description |
| 19% |
F01N3 |
Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust |
| |
|
|
| 13% |
B01D53 |
Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols |
| |
|
|
| 3% |
F02D41 |
Electrical control of supply of combustible mixture or its constituents |
| |
|
|
| 2% |
B01J23 |
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group 21/00 |
| |
|
|
| 2% |
B01J35 |
Catalysts, in general, characterised by their form or physical properties |
| |
|
|
| 2% |
B63H21 |
Use of propulsion power plant or units on vessels |
| |
|
|
| 2% |
C10L1 |
Liquid carbonaceous fuels |
| |
|
|
| 2% |
C22C38 |
Ferrous alloys, e.g. steel alloys |
| |
|
|
| 2% |
F23N5 |
Systems for controlling combustion |
| |
|
|
| 2% |
F23R3 |
Continuous combustion chambers using liquid or gaseous fuel |
| |
|
|
| 1% |
B01J8 |
Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes |
| |
|
|
| 1% |
F01N7 |
Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups 1/00 to 5/00, 9/00, 11/00 |
| |
|
|
| 1% |
F01N11 |
Monitoring or diagnostic devices for exhaust-gas treatment apparatus |
| |
|
|
| 1% |
F02C3 |
Gas-turbine plants characterised by the use of combustion products as the working fluid |
| |
|
|
| 1% |
F23J15 |
Arrangements of devices for treating smoke or fumes |