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CPC technology class · F23

F23K - Feeding FUEL TO Combustion Apparatus

Feeding fuel to combustion apparatus. 754 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

754
US patents granted
F23
Parent CPC class
20
Active assignees
+8%
5-yr velocity

The verdict

Feeding FUEL TO Combustion Apparatus ranks #486 of 670 CPC technology areas - 754 US patents granted since 2015, with filing up 8% over five years.

#486
of 670 CPC technology areas
754
US patents granted, 2015–2025
General Electric
leading assignee (76)
+8%
filing velocity, last 5 yrs
Top assignee: General Electric Company (76 patents)

CPC subclass F23K - FEEDING FUEL TO COMBUSTION APPARATUS - covers 754 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class F23 (COMBUSTION APPARATUS; COMBUSTION PROCESSES). See our CPC classification guide for how the system works.

The competitive landscape in F23K is shaped by 20 distinct companies actively filing in this space. General Electric Company leads with 76 patents, followed by Delavan Inc. at 10 grants and Ada-es, Inc. at 10.

Filing activity in F23K is up 8% over the past five years versus 2015-2019, a relatively steady filing pace. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is F23K innovation accelerating?

US utility-patent grants per year in F23K, 2015–2025 - recent five years are up 8% versus 2015–2019.

20406080100 20152016201720182019202020212022202320242025 33

Who leads F23K?

The 12 most active assignees in FEEDING FUEL TO COMBUSTION APPARATUS - wider bars mean more grants

patents

What this shows General Electric is the most active filer in F23K, holding 76 of the 754 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 F23K
Rank Company Patents in F23K
#1 NOX II, Ltd. 15
#2 Delavan Inc. 10
#3 Ada-es, Inc. 10
#4 Ener-core Power, Inc. 8
#5 Progreen LABS, Llc 8
#6 Copreci, S.coop. 7
#7 Rinnai Corporation 6
#8 Grand Mate Co., Ltd. 6
#9 VRC Technology, Llc 6
#10 The Babcock & Wilcox Company 5
#11 Bill & Melinda Gates Foundation 5
#12 Eberspächer Climate Control Systems Gmbh 4
#13 Hyliion Inc. 4
#14 Robertshaw Controls Company 4
#15 GE Energy Products France SNC 4
#16 Babcock Power Services, Inc. 4
#17 SIT S.p.a. 4
#18 Getas Gesellschaft Für Thermodynamische Antriebssysteme Mbh 4
#19 University Of Leeds 3
#20 Precision Combustion, Inc. 3

About This Class

CPC subclass F23K belongs to class F23.

754 patents were granted in this class between 2015 and 2025.

20 companies actively patent in this space.

Classification System

Cooperative Patent Classification (CPC) is a hierarchical patent classification system used by the USPTO and EPO.

← All Technology Classes Technology Rankings →

Footprint here vs. claim strategy

Each dot is a leading F23K 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 F23K assignees by class footprint. Bubble size = patents in F23K. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 F23K assignees by class footprint. Bubble size = patents in F23K. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 010203040 05101520 Patents in F23K Avg claims / patent (company-wide) Nox IiDelavanAda-esEner-core PowerProgreen LabsCopreci S CoopRinnaiGrand MateVrc TechnologyThe Babcock & WilcoxBill & Melinda Gates…EberspÄCher Climate C…HyliionRobertshaw Controls
Top 14 F23K assignees by class footprint. Bubble size = patents in F23K. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class F23K?
CPC subclass F23K covers FEEDING FUEL TO COMBUSTION APPARATUS. It belongs to CPC class F23 (COMBUSTION APPARATUS; COMBUSTION PROCESSES), with 754 US utility patents granted since 2015.
How many patents have been filed in F23K?
754 US utility patents were granted in CPC subclass F23K between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F23K?
General Electric Company leads F23K with 76 patents, making it the most active assignee in this technology area.
How is patent data for F23K collected?
Patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office. It covers all US granted utility patents and assigns CPC codes based on the technology described in each patent.
What is the difference between CPC class and subclass?
A CPC class (e.g., F23) is a broad technology category. Subclasses like F23K provide finer granularity within that category. PlainPatent organizes data at the subclass level (4-character codes) for the most useful view of technology domains.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

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.