PlainPatent

CPC technology class · F01

F01N - Gas-flow Silencers Or Exhaust Apparatus For Machines Or E…

Gas-flow silencers or exhaust apparatus for machines or engines in general; gas-flow silencers or exhaust apparatus for internal-combustion engines. 12,144 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

12,144
US patents granted
#2/8
in F01
22.7%
F01 class share
-20%
5-yr velocity

The verdict

According to USPTO PatentsView, Gas-flow Silencers Or Exhaust Apparatus For Machines Or E… ranks #154 of 670 CPC technology areas - 12,144 US patents granted since 2015, with recorded grant volume down 20% over five years.

#154
of 670 CPC technology areas
12,144
US patents granted, 2015–2025
Toyota Jidosha
leading assignee (978)
-20%
grant velocity, last 5 yrs

How F01N's grant cadence moved

Between 2020–2024, F01N recorded 4,905 grants versus 6,123 in 2015–2019 (-20% equal-window velocity). Across complete years, output peaked in 2019 at 1,382 grants and bottomed in 2024 at 661 (+109% peak-over-trough). Lead assignee Toyota Jidosha Kabushiki Kaisha holds 8.1% of the class ; the top three share 17.8%.

Leaderboard read

F01N concentration, lead at 8.1%

Toyota Jidosha Kabushiki Kaisha leads this historical grant record at 8.1% of F01N - foreign corporation assignees hold 61% of class grants (5,072 of 8,314). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
8.1%

978 of 12,144 grants

Top three share
17.8%

of the class's recorded grants

Lead over #2
203

more grants than Ford Global Technologies, LLC

Where F01N sits inside F01

Among 8 subclasses in F01 (Machines OR Engines IN GENERAL; Engine Plants IN GENERAL; Steam Engines), F01N ranks #2 and holds 22.7% of the parent class's 53,585 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F01D 24,492 F01L 4,152 F01P 4,129 F01M 3,398 F01K 2,854 F01C 1,662 F01B 754

Rising assignees active in F01N

Company-wide grant multiples (2022–2024 vs 2019–2021) among assignees with ≥5 patents in this subclass. Growth is company-wide; class patent counts are subclass-specific.

  1. #1 Mercedes-Benz Group AG 257x 0 → 257 company-wide · 12 in F01N
  2. #2 Kawasaki Motors, Ltd. 146x 0 → 146 company-wide · 7 in F01N
  3. #3 Volvo Penta Corporation 10x 2 → 20 company-wide · 6 in F01N
  4. #4 TE Connectivity Norge AS 9.00x 1 → 9 company-wide · 5 in F01N
  5. #5 Yantai Jereh Petroleum Equipment & Technologies Co., Ltd. 8.92x 12 → 107 company-wide · 8 in F01N

F01N grants by year, peak 2019 (1,382)

US utility-patent grants per year in F01N, 2015–2025 - recent five years are down 20% versus 2015–2019.

4006008001,0001,2001,4001,600 20152016201720182019202020212022202320242025 491

Who leads F01N?

The 12 most active assignees in Gas-flow Silencers OR Exhaust Apparatus FOR Machines OR Engines IN GENERAL; Gas-flow Silencers OR Exhaust Apparatus FOR Internal-combustion Engines - wider bars mean more grants

patents

What this shows Toyota Jidosha is the most active filer in F01N, holding 978 of the 12,144 patents in this class. Concentration at the top signals how contestable this technology area is for new entrants.

Source USPTO PatentsView, granted utility patents As of 2015–2025 grant years
View data table
Top patent holders in CPC subclass F01N
Rank Company Patents in F01N
#1 Toyota Jidosha Kabushiki Kaisha 978
#2 Ford Global Technologies, LLC 775
#3 GM Global Technology Operations LLC 409
#4 NGK Insulators, Ltd. 319
#5 Cummins Emission Solutions Inc. 309
#6 Cummins Inc. 256
#7 Johnson Matthey Public Limited Company 237
#8 Caterpillar Inc. 223
#9 Tenneco Automotive Operating Company LLC 164
#10 Isuzu Motors Limited 151
#11 Eberspächer Exhaust Technology GmbH 136
#12 Umicore AG & Co. KG 131
#13 Cataler Corporation 124
#14 Faurecia Emissions Control Technologies, USA, LLC 119
#15 Volvo Truck Corporation 118
#16 Komatsu Ltd. 111
#17 Vitesco Technologies GMBH 108
#18 Yanmar Holdings Co., Ltd. 107
#19 Emitec Gesellschaft fuer Emissionstechnologie mbH 102
#20 Continental Automotive GMBH 100

Footprint here vs. claim strategy

Each dot is a leading F01N assignee, placed by how many patents it holds in this class (horizontal) against its company-wide average claims per patent (vertical) - a read on whether the class is led by broad-but-shallow filers or focused deep-claim players.

Top 14 F01N assignees by class footprint. Bubble size = patents in F01N. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 020040060080010001200 Patents in F01N Avg claims / patent (company-wide) Toyota JidoshaFord GlobalGm Global Technology…Ngk InsulatorsCummins Emission…CumminsJohnson Matthey PublicCaterpillarTenneco Automotive…Isuzu MotorsEberspächer Exhaust…Umicore & KgCatalerFaurecia Emissions…
Top 14 F01N assignees by class footprint. Bubble size = patents in F01N. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near F01N's 12,144-grant footprint

Nationwide nearest neighbors for F01N (#154 of 670 by volume ; lead share 8.1%) - not the F01 parent-class siblings above.

Nearest by grant volume

F25B 12,158 B05B 12,186 G09B 12,324 C01P 12,347

Nearest by lead-assignee share

B04B 8.1% D10B 8.1% B60T 8.1% B60H 8.0%

Questions about F01N

Which company holds the most patents in F01N?
Toyota Jidosha Kabushiki Kaisha leads F01N with 978 patents (8.1% of the subclass). By PatentsView assignee type, foreign corporations account for 61% of class grants.
Which F01N assignees grew fastest recently?
Among assignees with ≥5 grants in F01N, Mercedes-Benz Group AG shows the highest company-wide grant multiple (257x: 0 grants in 2019–2021 → 257 in 2022–2024) while holding 12 patents in this subclass. Growth is company-wide, not class-only.
How does F01N compare inside parent class F01?
Inside F01 (Machines OR Engines IN GENERAL; Engine Plants IN GENERAL; Steam Engines), F01N ranks #2 of 8 subclasses by grant volume and holds 22.7% of the parent class total. The largest sibling is F01D (24,492 grants).

What to do with this data

F01N in context - here's where to go next.

  • Toyota Jidosha Kabushiki Kaisha leads F01N with 978 grants in this class. See full portfolio
  • F01N ranks #154 of 670 by grant volume among all tracked CPC technology areas. See the ranking
  • Inside parent class F01, the largest sibling subclass is F01D with 24,492 grants. Explore F01D

Figures reflect USPTO PatentsView grant data through 2026-05-15; pending applications not yet granted are not counted.

Methodology - F01N figures are USPTO PatentsView granted-utility totals for this subclass (12,144 grants in the tracked window).

Every figure on PlainPatent is rendered directly from USPTO source data, no number is typed in by an editor. This page draws directly on USPTO source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.