|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

ENGINES AND PUMPS

|  | F01 |
MACHINES OR ENGINES IN GENERAL (combustion engines Fulltext... Hierarchy... Expanded...F02; machines for liquids Fulltext... Hierarchy... Expanded...F03, Fulltext... Hierarchy... Expanded...F04); ENGINE PLANTS IN GENERAL; STEAM ENGINES

|  | F01N |
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines Fulltext... Hierarchy... Expanded...F02M 35/00; protecting against, or damping, noise in general Fulltext... Hierarchy... Expanded...G10K 11/00)

|  | F01N |
Note(s) Attention is drawn to the notes preceding class Fulltext... Hierarchy... Expanded...F01, especially as regards Note 2 (b).

|  | F01N 1/00 |
Silencing apparatus characterised by method of silencing

|  | F01N 1/02 |
· | by using resonance

|  | F01N 1/04 |
· · | having sound-absorbing materials in resonance chambers

|  | F01N 1/06 |
· | by using interference effect

|  | F01N 1/08 |
· | by reducing exhaust energy by throttling or whirling

|  | F01N 1/10 |
· · | in combination with sound-absorbing materials

|  | F01N 1/12 |
· · | using spirally- or helically-shaped channels (Fulltext... Hierarchy... Expanded...F01N 1/10 takes precedence; cyclones Fulltext... Hierarchy... Expanded...B04C)

|  | F01N 1/14 |
· | by adding air to exhaust gases

|  | F01N 1/16 |
· | by using movable parts

|  | F01N 1/18 |
· · | having rotary movement

|  | F01N 1/20 |
· · | having oscillating or vibrating movement (the parts being resilient walls Fulltext... Hierarchy... Expanded...F01N 1/22)

|  | F01N 1/22 |
· · | the parts being resilient walls

|  | F01N 1/24 |
· | by using sound-absorbing materials (Fulltext... Hierarchy... Expanded...F01N 1/04, Fulltext... Hierarchy... Expanded...F01N 1/06, Fulltext... Hierarchy... Expanded...F01N 1/10, Fulltext... Hierarchy... Expanded...F01N 1/14, Fulltext... Hierarchy... Expanded...F01N 1/16 take precedence)

|  | F01N 3/00 |
Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust

|  | F01N 3/02 |
· | for cooling, or for removing solid constituents of, exhaust

|  | F01N 3/04 |
· · | using liquids

|  | F01N 3/06 |
· | for extinguishing sparks

|  | F01N 3/08 |
· | for rendering innocuous

|  | F01N 3/10 |
· · | by burning, e.g. by after-burning using additional air

|  | F01N 3/12 |
· · · | adding fuel (Fulltext... Hierarchy... Expanded...F01N 3/14 takes precedence)

|  | F01N 3/14 |
· · · | having igniting means, e.g. catalysts

|  | F01N 3/16 |
· · | by other chemical processes

|  | F01N 5/00 |
Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy (predominant aspects of such devices, see the relevant classes for the devices; using kinetic or wave energy of exhaust gases in exhaust systems for charging Fulltext... Hierarchy... Expanded...F02B)

|  | F01N 5/02 |
· | the devices using heat

|  | F01N 5/04 |
· | the devices using kinetic energy

|  | F01N 7/00 |
Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F01N 1/00-F01N 5/00

|  | F01N 7/02 |
· | Apparatus having two or more separate silencers in series

|  | F01N 7/04 |
· | Apparatus having two or more silencers in parallel for multi-cylinder engines, e.g. having interconnections

|  | F01N 7/06 |
· | specially adapted for star-arrangement of cylinders, e.g. exhaust manifolds

|  | F01N 7/08 |
· | Other arrangements or adaptations of exhaust conduits (pipes in general Fulltext... Hierarchy... Expanded...F16L)

|  | F01N 7/10 |
· · | of exhaust manifolds

|  | F01N 7/12 |
· | specially adapted for submerged exhausting

|  | F01N 7/14 |
· | having thermal insulation

|  | F01N 7/16 |
· | Selection of particular materials

|  | F01N 7/18 |
· | Construction facilitating manufacture, assembly, or disassembly

|  | F01N 7/20 |
· | Flared outlets, e.g. of fish-tail shape