CPC technology class · F02

F02G - Hot Gas Or Combustion-product Positive-displacement Engin…

Hot gas or combustion-product positive-displacement engine plants ; use of waste heat of combustion engines; not otherwise provided for. 812 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

812
US patents granted: #9/9
in F02: 1.1%
F02 class share: -12%
5-yr velocity

The verdict

According to USPTO PatentsView, Hot Gas Or Combustion-product Positive-displacement Engin… ranks #481 of 670 CPC technology areas - 812 US patents granted since 2015, with recorded grant volume down 12% over five years.

#481
of 670 CPC technology areas: 812
US patents granted, 2015–2025: Toyota Jidosha
leading assignee (27): -12%
grant velocity, last 5 yrs

How F02G's grant cadence moved

Between 2020–2024, F02G recorded 349 grants versus 396 in 2015–2019 (-12% equal-window velocity). Across complete years, output peaked in 2020 at 95 grants and bottomed in 2023 at 45 (+111% peak-over-trough). Lead assignee ICE Thermal Harvesting, LLC holds 3.2% of the class ; the top three share 6.4%.

Leaderboard read

F02G concentration, lead at 3.2%

ICE Thermal Harvesting, LLC leads this historical grant record at 3.2% of F02G - us corporation assignees hold 54% of class grants (107 of 200). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 3.2%
Top three share: 6.4%
Lead over #2: 13

Where F02G sits inside F02

Among 9 subclasses in F02 (Combustion ENGINES; Hot-gas OR Combustion-product Engine Plants), F02G ranks #9 and holds 1.1% of the parent class's 73,441 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F02D 16,949 F02C 16,237 F02M 13,937 F02B 11,001 F02K 5,533 F02N 3,467 F02P 2,762 F02F 2,743

Rising assignees active in F02G

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 ICE Thermal Harvesting, LLC 45x 1 → 45 company-wide · 26 in F02G
#2 New Power Concepts LLC 2.00x 1 → 2 company-wide · 13 in F02G
#3 Hyliion Inc. 1.50x 18 → 27 company-wide · 7 in F02G
#4 Etalim Inc. 1.00x 3 → 3 company-wide · 8 in F02G
#5 Sanden Corporation 0.81x 37 → 30 company-wide · 13 in F02G

F02G grants by year, peak 2020 (95)

US utility-patent grants per year in F02G, 2015–2025 - recent five years are down 12% versus 2015–2019.

Ice Thermal Harvesting

26
Sanden

13
New Power Concepts

13
Etalim

8
Hyliion

7
Getas Gesellschaft…

7
Cummins Intellectual…

5
Res Usa

5
Thermolift

5
Precision Combustion

4
Mahle Behr & Kg

4
Scuderi Group

4

What this shows Toyota Jidosha is the most active filer in F02G, holding 27 of the 812 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 F02G
Rank	Company	Patents in F02G
#1	ICE Thermal Harvesting, LLC	26
#2	Sanden Corporation	13
#3	New Power Concepts LLC	13
#4	Etalim Inc.	8
#5	Hyliion Inc.	7
#6	Getas Gesellschaft für thermodynamische Antriebssysteme mbH	7
#7	Cummins Intellectual Property, Inc.	5
#8	RES USA, LLC	5
#9	ThermoLift, Inc.	5
#10	Precision Combustion, Inc.	4
#11	Mahle Behr GmbH & Co. KG	4
#12	Scuderi Group, Inc.	4
#13	Boostheat	4
#14	Emitec Gesellschaft fuer Emissionstechnologie mbH	3
#15	Innio Jenbacher GmbH & Co OG	3
#16	Mainspring Energy, Inc.	3
#17	Miura Co., Ltd.	3
#18	Central Motor Wheel Co., Ltd.	3
#19	Ener-Core Power, Inc.	3
#20	Bosal Emission Control Systems NV	3

Footprint here vs. claim strategy

Each dot is a leading F02G 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 F02G assignees by class footprint. Bubble size = patents in F02G. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near F02G's 812-grant footprint

Nationwide nearest neighbors for F02G (#481 of 670 by volume ; lead share 3.3%) - not the F02 parent-class siblings above.

Nearest by grant volume

B21F 817 B61F 797 G10D 828 B23H 839

Nearest by lead-assignee share

D03D 3.3% D01F 3.3% F41H 3.3% E04G 3.3%

Questions about F02G

Which company holds the most patents in F02G?

Toyota Jidosha Kabushiki Kaisha leads F02G with 27 patents (3.2% of the subclass). By PatentsView assignee type, us corporations account for 54% of class grants.

Which F02G assignees grew fastest recently?

Among assignees with ≥5 grants in F02G, ICE Thermal Harvesting, LLC shows the highest company-wide grant multiple (45x: 1 grants in 2019–2021 → 45 in 2022–2024) while holding 26 patents in this subclass. Growth is company-wide, not class-only.

How does F02G compare inside parent class F02?

Inside F02 (Combustion ENGINES; Hot-gas OR Combustion-product Engine Plants), F02G ranks #9 of 9 subclasses by grant volume and holds 1.1% of the parent class total. The largest sibling is F02D (16,949 grants).

What to do with this data

F02G in context - here's where to go next.

ICE Thermal Harvesting, LLC leads F02G with 26 grants in this class. See full portfolio
F02G ranks #481 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class F02, the largest sibling subclass is F02D with 16,949 grants. Explore F02D

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

Methodology - F02G figures are USPTO PatentsView granted-utility totals for this subclass (812 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.