PlainPatent

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 filing trajectory.

812
US patents granted
F02
Parent CPC class
20
Active assignees
-5%
5-yr velocity

The verdict

HOT GAS OR Combustion-product Positive-displacement Engin… ranks #481 of 670 CPC technology areas - 812 US patents granted since 2015, with filing down 5% over five years.

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

CPC subclass F02G - HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS ; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR - covers 812 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class F02 (COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS). See our CPC classification guide for how the system works.

The competitive landscape in F02G is shaped by 20 distinct companies actively filing in this space. Toyota Jidosha Kabushiki Kaisha leads with 27 patents, followed by Sanden Corporation at 13 grants and New Power Concepts Llc at 13.

Filing activity in F02G is down 5% 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 F02G innovation accelerating?

US utility-patent grants per year in F02G, 2015–2025 - recent five years are down 5% versus 2015–2019.

20406080100 20152016201720182019202020212022202320242025 28

Who leads F02G?

The 12 most active assignees in HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS ; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR - wider bars mean more grants

patents

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.

Source USPTO PatentsView, granted utility patents As of 2015–2025 grant years
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

About This Class

CPC subclass F02G belongs to class F02.

812 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 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).

Top 14 F02G assignees by class footprint. Bubble size = patents in F02G. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 51015202530 0102030 Patents in F02G Avg claims / patent (company-wide) Ice Thermal HarvestingSandenNew Power ConceptsEtalimHyliionGetas Gesellschaft fü…Cummins Intellectual…Res UsaThermoliftPrecision CombustionMahle Behr & KgScuderi GroupBoostheatEmitec Gesellschaft f…
Top 14 F02G assignees by class footprint. Bubble size = patents in F02G. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class F02G?
CPC subclass F02G covers HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS ; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR. It belongs to CPC class F02 (COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS), with 812 US utility patents granted since 2015.
How many patents have been filed in F02G?
812 US utility patents were granted in CPC subclass F02G between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F02G?
Toyota Jidosha Kabushiki Kaisha leads F02G with 27 patents, making it the most active assignee in this technology area.
How is patent data for F02G 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., F02) is a broad technology category. Subclasses like F02G 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.