• All sections
• F - Mechanical engineeringlightingheatingweaponsblasting
• F01N - Gas-flow silencers or exhaust apparatus for machines or engines in generalgas-flow silencers or exhaust apparatus for internal-combustion engines
• F01N 3/033 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices

Patent holdings for IPC class F01N 3/033

Total number of patents in this class: 135

10-year publication summary

Principal owners for this class