PlainPatent

CPC technology class · F24

F24H - Fluid Heaters

Fluid heaters, e.g. water or air heaters, having heat-generating means, e.g. heat pumps, in general. 2,950 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

2,950
US patents granted
F24
Parent CPC class
20
Active assignees
+26%
5-yr velocity

The verdict

Fluid Heaters ranks #320 of 670 CPC technology areas - 2,950 US patents granted since 2015, with filing up 26% over five years.

#320
of 670 CPC technology areas
2,950
US patents granted, 2015–2025
Rheem Manufacturing
leading assignee (188)
+26%
filing velocity, last 5 yrs
Top assignee: Rheem Manufacturing Company (188 patents)

CPC subclass F24H - FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL - covers 2,950 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class F24 (HEATING; RANGES; VENTILATING). See our CPC classification guide for how the system works.

The competitive landscape in F24H is shaped by 20 distinct companies actively filing in this space. Rheem Manufacturing Company leads with 188 patents, followed by Noritz Corporation at 106 grants and Kyungdong Navien Co., Ltd. at 78.

Filing activity in F24H is up 26% over the past five years versus 2015-2019, a sharp acceleration suggesting an emerging or fast-moving technology area. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is F24H innovation accelerating?

US utility-patent grants per year in F24H, 2015–2025 - recent five years are up 26% versus 2015–2019.

150200250300350 20152016201720182019202020212022202320242025 186

Who leads F24H?

The 12 most active assignees in FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL - wider bars mean more grants

patents

What this shows Rheem Manufacturing is the most active filer in F24H, holding 188 of the 2,950 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 F24H
Rank Company Patents in F24H
#1 Rheem Manufacturing Company 188
#2 Noritz Corporation 106
#3 Kyungdong Navien Co., Ltd. 78
#4 A. O. Smith Corporation 63
#5 Rinnai Corporation 62
#6 Haier US Appliance Solutions, Inc. 59
#7 Lennox Industries Inc. 58
#8 Trane International Inc. 40
#9 Intellihot, Inc. 37
#10 Emerson Electric Co. 35
#11 Eberspächer Catem Gmbh & Co. 33
#12 Ademco Inc. 28
#13 Watlow Electric Manufacturing Company 21
#14 Eberspächer Climate Control Systems Gmbh 21
#15 Dyson Technology Limited 20
#16 Valeo Systemes Thermiques 20
#17 Rinnai America Corporation 19
#18 Miclau-s.r.i. Inc. 19
#19 Regal Beloit America, Inc. 18
#20 Borgwarner Ludwigsburg Gmbh 18

About This Class

CPC subclass F24H belongs to class F24.

2,950 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 F24H 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 F24H assignees by class footprint. Bubble size = patents in F24H. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 F24H assignees by class footprint. Bubble size = patents in F24H. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 05101520 050100150200 Patents in F24H Avg claims / patent (company-wide) Rheem ManufacturingNoritzKyungdong NavienA O SmithRinnaiHaier Us Appliance So…Lennox IndustriesTrane InternationalIntellihotEmerson ElectricEberspächer Catem &AdemcoWatlow Electric Manuf…EberspÄCher Climate C…
Top 14 F24H assignees by class footprint. Bubble size = patents in F24H. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class F24H?
CPC subclass F24H covers FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL. It belongs to CPC class F24 (HEATING; RANGES; VENTILATING), with 2,950 US utility patents granted since 2015.
How many patents have been filed in F24H?
2,950 US utility patents were granted in CPC subclass F24H between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F24H?
Rheem Manufacturing Company leads F24H with 188 patents, making it the most active assignee in this technology area.
How is patent data for F24H 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., F24) is a broad technology category. Subclasses like F24H 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.