CPC technology class · F05

F05D - Indexing Scheme FOR Aspects Relating TO Non-positive-disp…

Indexing scheme for aspects relating to non-positive-displacement machines or engines, gas-turbines or jet-propulsion plants. 30,682 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

Compiled byPlainPatent Editorial, US Patent Intelligence Editorial Team · May 15, 2026

30,682
US patents granted: F05
Parent CPC class: 20
Active assignees: +56%
5-yr velocity

The verdict

Indexing Scheme FOR Aspects Relating TO Non-positive-disp… ranks #63 of 670 CPC technology areas - 30,682 US patents granted since 2015, with filing up 56% over five years.

#63
of 670 CPC technology areas: 30,682
US patents granted, 2015–2025: General Electric
leading assignee (4,320): +56%
filing velocity, last 5 yrs

Top assignee: General Electric Company (4,320 patents)

CPC subclass F05D - INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - covers 30,682 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class F05 (INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04). See our CPC classification guide for how the system works.

The competitive landscape in F05D is shaped by 20 distinct companies actively filing in this space. General Electric Company leads with 4,320 patents, followed by United Technologies Corporation at 2,932 grants and Raytheon Technologies Corporation at 2,019.

Filing activity in F05D is up 56% 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 F05D innovation accelerating?

US utility-patent grants per year in F05D, 2015–2025 - recent five years are up 56% versus 2015–2019.

General Electric

4,320
United

2,932
Raytheon

2,019
Safran Aircraft Engin…

1,380
Rolls-royce

1,364
Pratt & Whitney Canada

1,334
Rtx

828
Rolls-royce

794
Rolls-royce North Ame…

601
Mitsubishi Electric

574
Hamilton Sundstrand (…

562
Honeywell Internation…

482

What this shows General Electric is the most active filer in F05D, holding 4,320 of the 30,682 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 F05D
Rank	Company	Patents in F05D
#1	General Electric Company	4,320
#2	United Technologies Corporation	2,932
#3	Raytheon Technologies Corporation	2,019
#4	Safran Aircraft Engines	1,380
#5	Rolls-royce Plc	1,364
#6	Pratt & Whitney Canada Corp.	1,334
#7	RTX Corporation	828
#8	Rolls-royce Corporation	794
#9	Rolls-royce North American Technologies Inc.	601
#10	Mitsubishi Electric Corporation	574
#11	Hamilton Sundstrand Corporation (hsc)	562
#12	Honeywell International Inc.	482
#13	Snecma	424
#14	MTU Aero Engines Ag	416
#15	Siemens Aktiengesellschaft	399
#16	Borgwarner Inc.	358
#17	Rolls-royce Deutschland Ltd & Co KG	338
#18	ROHR, Inc.	287
#19	IHI Corporation	281
#20	Mitsubishi Hitachi Power Systems, Ltd.	275

About This Class

CPC subclass F05D belongs to class F05.

30,682 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 F05D 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 F05D assignees by class footprint. Bubble size = patents in F05D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class F05D?

CPC subclass F05D covers INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS. It belongs to CPC class F05 (INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04), with 30,682 US utility patents granted since 2015.

How many patents have been filed in F05D?

30,682 US utility patents were granted in CPC subclass F05D between 2015 and 2025, based on USPTO PatentsView data.

Which company holds the most patents in F05D?

General Electric Company leads F05D with 4,320 patents, making it the most active assignee in this technology area.

How is patent data for F05D 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., F05) is a broad technology category. Subclasses like F05D 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.