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 grant trajectory.

Compiled by PlainPatent · May 15, 2026

2,950
US patents granted: #4/8
in F24: 10.8%
F24 class share: +11%
5-yr velocity

The verdict

According to USPTO PatentsView, Fluid Heaters ranks #320 of 670 CPC technology areas - 2,950 US patents granted since 2015, with recorded grant volume up 11% over five years.

#320
of 670 CPC technology areas: 2,950
US patents granted, 2015–2025: Rheem Manufacturing
leading assignee (188): +11%
grant velocity, last 5 yrs

How F24H's grant cadence moved

Between 2020–2024, F24H recorded 1,417 grants versus 1,275 in 2015–2019 (+11% equal-window velocity). Across complete years, output peaked in 2019 at 330 grants and bottomed in 2015 at 159 (+108% peak-over-trough). Lead assignee Rheem Manufacturing Company holds 6.4% of the class ; the top three share 12.6%.

Leaderboard read

F24H concentration, lead at 6.4%

Rheem Manufacturing Company leads this historical grant record at 6.4% of F24H - us corporation assignees hold 54% of class grants (898 of 1,665). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 6.4%
Top three share: 12.6%
Lead over #2: 82

Where F24H sits inside F24

Among 8 subclasses in F24 (HEATING; RANGES; Ventilating), F24H ranks #4 and holds 10.8% of the parent class's 27,261 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F24F 14,049 F24C 3,868 F24S 3,307 F24D 2,041 F24T 436 F24B 409 F24V 201

Rising assignees active in F24H

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 Copeland Comfort Control LP 17x 0 → 17 company-wide · 8 in F24H
#2 Modology Design Group 8.00x 0 → 8 company-wide · 8 in F24H
#3 Rinnai America Corporation 5.67x 3 → 17 company-wide · 19 in F24H
#4 Octopus Energy Heating Limited 5.00x 0 → 5 company-wide · 13 in F24H
#5 Giant Factories Inc. 5.00x 0 → 5 company-wide · 5 in F24H

F24H grants by year, peak 2019 (330)

US utility-patent grants per year in F24H, 2015–2025 - recent five years are up 11% versus 2015–2019.

Rheem Manufacturing

188
Noritz

106
Kyungdong Navien

78
A O Smith

63
Rinnai

62
Haier Us Appliance…

59
Lennox Industries

58
Trane International

40
Intellihot

37
Emerson Electric

35
Eberspächer Catem &

33
Ademco

28

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.

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

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).

Classes near F24H's 2,950-grant footprint

Nationwide nearest neighbors for F24H (#320 of 670 by volume ; lead share 6.4%) - not the F24 parent-class siblings above.

Nearest by grant volume

G05G 2,952 A62C 2,939 E05C 2,961 B02C 2,934

Nearest by lead-assignee share

A62D 6.4% A63H 6.4% G16Y 6.4% B23Q 6.4%

Questions about F24H

Which company holds the most patents in F24H?

Rheem Manufacturing Company leads F24H with 188 patents (6.4% of the subclass). By PatentsView assignee type, us corporations account for 54% of class grants.

Which F24H assignees grew fastest recently?

Among assignees with ≥5 grants in F24H, Copeland Comfort Control LP shows the highest company-wide grant multiple (17x: 0 grants in 2019–2021 → 17 in 2022–2024) while holding 8 patents in this subclass. Growth is company-wide, not class-only.

How does F24H compare inside parent class F24?

Inside F24 (HEATING; RANGES; Ventilating), F24H ranks #4 of 8 subclasses by grant volume and holds 10.8% of the parent class total. The largest sibling is F24F (14,049 grants).

What to do with this data

F24H in context - here's where to go next.

Rheem Manufacturing Company leads F24H with 188 grants in this class. See full portfolio
F24H ranks #320 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class F24, the largest sibling subclass is F24F with 14,049 grants. Explore F24F

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

Methodology - F24H figures are USPTO PatentsView granted-utility totals for this subclass (2,950 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.