PlainPatent

CPC technology class · F23

F23D - Burners

Burners. 2,623 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

2,623
US patents granted
F23
Parent CPC class
20
Active assignees
-3%
5-yr velocity

The verdict

Burners ranks #342 of 670 CPC technology areas - 2,623 US patents granted since 2015, with filing down 3% over five years.

#342
of 670 CPC technology areas
2,623
US patents granted, 2015–2025
General Electric
leading assignee (186)
-3%
filing velocity, last 5 yrs
Top assignee: General Electric Company (186 patents)

CPC subclass F23D - BURNERS - covers 2,623 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 F23D is shaped by 20 distinct companies actively filing in this space. General Electric Company leads with 186 patents, followed by Haier US Appliance Solutions, Inc. at 54 grants and Clearsign Combustion Corporation at 48.

Filing activity in F23D is down 3% 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 F23D innovation accelerating?

US utility-patent grants per year in F23D, 2015–2025 - recent five years are down 3% versus 2015–2019.

100150200250300350 20152016201720182019202020212022202320242025 130

Who leads F23D?

The 12 most active assignees in BURNERS - wider bars mean more grants

patents

What this shows General Electric is the most active filer in F23D, holding 186 of the 2,623 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 F23D
Rank Company Patents in F23D
#1 Delavan Inc. 62
#2 Haier US Appliance Solutions, Inc. 54
#3 Clearsign Combustion Corporation 48
#4 Rinnai Corporation 45
#5 Pro-iroda Industries, Inc. 43
#6 Mitsubishi Hitachi Power Systems, Ltd. 35
#7 Lennox Industries Inc. 35
#8 Eberspächer Climate Control Systems Gmbh 29
#9 AIR Products AND Chemicals, Inc. 27
#10 Kyungdong Navien Co., Ltd. 27
#11 Clearsign Technologies Corporation 25
#12 BSH Hausgeräte Gmbh 23
#13 Rheem Manufacturing Company 22
#14 Doosan Enerbility Co., Ltd. 22
#15 Alstom Technology Ltd 20
#16 Lamplight Farms Incorporated 20
#17 Noritz Corporation 17
#18 8 Rivers Capital, Llc 17
#19 Collins Engine Nozzles, Inc. 17
#20 Webasto SE 16

About This Class

CPC subclass F23D belongs to class F23.

2,623 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 F23D 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 F23D assignees by class footprint. Bubble size = patents in F23D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 F23D assignees by class footprint. Bubble size = patents in F23D. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 010203040 203040506070 Patents in F23D Avg claims / patent (company-wide) DelavanHaier Us Appliance So…Clearsign CombustionRinnaiPro-iroda IndustriesMitsubishi Hitachi Po…Lennox IndustriesEberspÄCher Climate C…Air Products And Chem…Kyungdong NavienClearsignBsh HausgeräteRheem ManufacturingDoosan Enerbility
Top 14 F23D assignees by class footprint. Bubble size = patents in F23D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class F23D?
CPC subclass F23D covers BURNERS. It belongs to CPC class F23 (COMBUSTION APPARATUS; COMBUSTION PROCESSES), with 2,623 US utility patents granted since 2015.
How many patents have been filed in F23D?
2,623 US utility patents were granted in CPC subclass F23D between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F23D?
General Electric Company leads F23D with 186 patents, making it the most active assignee in this technology area.
How is patent data for F23D 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 F23D 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.