CPC technology class · F23

F23Q - Ignition

Ignition ; extinguishing-devices. 516 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

516
US patents granted: #10/12
in F23: 3.4%
F23 class share: -22%
5-yr velocity

The verdict

According to USPTO PatentsView, Ignition ranks #538 of 670 CPC technology areas - 516 US patents granted since 2015, with recorded grant volume down 22% over five years.

#538
of 670 CPC technology areas: 516
US patents granted, 2015–2025: Ngk Spark Plug
leading assignee (35): -22%
grant velocity, last 5 yrs

How F23Q's grant cadence moved

Between 2020–2024, F23Q recorded 215 grants versus 274 in 2015–2019 (-22% equal-window velocity). Across complete years, output peaked in 2017 at 66 grants and bottomed in 2021 at 34 (+94% peak-over-trough). Lead assignee NGK Spark Plug Co., Ltd. holds 6.8% of the class ; the top three share 11.4%.

Leaderboard read

F23Q concentration, lead at 6.8%

NGK Spark Plug Co., Ltd. leads this historical grant record at 6.8% of F23Q - us corporation assignees hold 53% of class grants (111 of 210). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 6.8%
Top three share: 11.4%
Lead over #2: 19

Where F23Q sits inside F23

Among 12 subclasses in F23 (Combustion APPARATUS; Combustion Processes), F23Q ranks #10 and holds 3.4% of the parent class's 15,279 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F23R 4,138 F23D 2,623 F23N 1,763 F23C 1,571 F23J 1,082 F23G 1,073 F23L 922 F23K 754

Rising assignees active in F23Q

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 Collins Engine Nozzles, Inc. 74x 0 → 74 company-wide · 6 in F23Q
#2 Ludela Technologies LLC 2.00x 2 → 4 company-wide · 6 in F23Q
#3 Beyrodts Best LLC 2.00x 1 → 2 company-wide · 5 in F23Q
#4 Bosch Corporation 1.00x 5 → 5 company-wide · 6 in F23Q
#5 Pro-iroda Industries, Inc. 0.96x 24 → 23 company-wide · 6 in F23Q

F23Q grants by year, peak 2017 (66)

US utility-patent grants per year in F23Q, 2015–2025 - recent five years are down 22% versus 2015–2019.

Ngk Spark Plug

35
Borgwarner Ludwigsburg

16
Societe Bic

8
Clearsign Combustion

8
Collins Engine Nozzles

6
Pro-iroda Industries

6
Bosch

6
Lamplight Farms…

6
Ludela

6
Beyrodts Best

5
Chentronics

5
Orbital Atk

4

What this shows Ngk Spark Plug is the most active filer in F23Q, holding 35 of the 516 patents in this class. Concentration at the top signals how contestable this technology area is for new entrants.

View data table

Top patent holders in CPC subclass F23Q
Rank	Company	Patents in F23Q
#1	NGK Spark Plug Co., Ltd.	35
#2	BorgWarner Ludwigsburg GmbH	16
#3	Societe BIC	8
#4	Clearsign Combustion Corporation	8
#5	Collins Engine Nozzles, Inc.	6
#6	Pro-iroda Industries, Inc.	6
#7	Bosch Corporation	6
#8	Lamplight Farms Incorporated	6
#9	Ludela Technologies LLC	6
#10	Beyrodts Best LLC	5
#11	Chentronics, LLC	5
#12	Orbital ATK, Inc.	4
#13	EBERSPÄCHER Climate Control Systems GMBH	4
#14	Traeger Pellet Grills, LLC	4
#15	Outdoor Edge Cutlery, LLC	4
#16	Channel Products, Inc.	4
#17	ClearSign Technologies Corporation	3
#18	Worthington Torch, LLC	3
#19	Zippo Manufacturing Company	3
#20	ProCom Heating, Inc.	3

Footprint here vs. claim strategy

Each dot is a leading F23Q 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 F23Q assignees by class footprint. Bubble size = patents in F23Q. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near F23Q's 516-grant footprint

Nationwide nearest neighbors for F23Q (#538 of 670 by volume ; lead share 6.8%) - not the F23 parent-class siblings above.

Nearest by grant volume

C05B 513 B28C 511 A41H 522 B61K 506

Nearest by lead-assignee share

B61H 6.8% B24B 6.8% B23C 6.8% C09C 6.8%

Questions about F23Q

Which company holds the most patents in F23Q?

NGK Spark Plug Co., Ltd. leads F23Q with 35 patents (6.8% of the subclass). By PatentsView assignee type, us corporations account for 53% of class grants.

Which F23Q assignees grew fastest recently?

Among assignees with ≥5 grants in F23Q, Collins Engine Nozzles, Inc. shows the highest company-wide grant multiple (74x: 0 grants in 2019–2021 → 74 in 2022–2024) while holding 6 patents in this subclass. Growth is company-wide, not class-only.

How does F23Q compare inside parent class F23?

Inside F23 (Combustion APPARATUS; Combustion Processes), F23Q ranks #10 of 12 subclasses by grant volume and holds 3.4% of the parent class total. The largest sibling is F23R (4,138 grants).

What to do with this data

F23Q in context - here's where to go next.

NGK Spark Plug Co., Ltd. leads F23Q with 35 grants in this class. See full portfolio
F23Q ranks #538 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class F23, the largest sibling subclass is F23R with 4,138 grants. Explore F23R

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

Methodology - F23Q figures are USPTO PatentsView granted-utility totals for this subclass (516 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.