• 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 3/031 - 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 having means for by-passing filters, e.g. when clogged or during cold engine start

Patent holdings for IPC class F01N 3/031

Total number of patents in this class: 75

10-year publication summary

Principal owners for this class