PlainPatent

CPC technology class · G21

G21F - Protection Against X-radiation

Protection against x-radiation, gamma radiation, corpuscular radiation or particle bombardment; treating radioactively contaminated material; decontamination arrangements therefor. 1,599 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

1,599
US patents granted
G21
Parent CPC class
20
Active assignees
+7%
5-yr velocity

The verdict

Protection Against X-radiation ranks #399 of 670 CPC technology areas - 1,599 US patents granted since 2015, with filing up 7% over five years.

#399
of 670 CPC technology areas
1,599
US patents granted, 2015–2025
Holtec International
leading assignee (111)
+7%
filing velocity, last 5 yrs
Top assignee: Holtec International (111 patents)

CPC subclass G21F - PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR - covers 1,599 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class G21 (NUCLEAR PHYSICS; NUCLEAR ENGINEERING). See our CPC classification guide for how the system works.

The competitive landscape in G21F is shaped by 20 distinct companies actively filing in this space. Holtec International leads with 111 patents, followed by Westinghouse Electric Company Llc at 33 grants and Korea Atomic Energy Research Institute at 30.

Filing activity in G21F is up 7% 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 G21F innovation accelerating?

US utility-patent grants per year in G21F, 2015–2025 - recent five years are up 7% versus 2015–2019.

80100120140160180 20152016201720182019202020212022202320242025 91

Who leads G21F?

The 12 most active assignees in PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR - wider bars mean more grants

patents

What this shows Holtec International is the most active filer in G21F, holding 111 of the 1,599 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 G21F
Rank Company Patents in G21F
#1 Holtec International 111
#2 Westinghouse Electric Company Llc 33
#3 Korea Atomic Energy Research Institute 30
#4 Xyleco, Inc. 30
#5 Korea Hydro & Nuclear Power Co., Ltd. 28
#6 Deep Isolation, Inc. 25
#7 TN International 21
#8 Ge-hitachi Nuclear Energy Americas Llc 18
#9 Framatome 17
#10 Hitachi-ge Nuclear Energy, Ltd. 16
#11 Bracco Diagnostics Inc. 16
#12 Savannah River Nuclear Solutions, Llc 15
#13 Areva Gmbh 13
#14 Radux Devices, Llc 12
#15 NAC International Inc. 12
#16 Areva NC 11
#17 Kurion, Inc. 10
#18 Getinge LA Calhene 10
#19 Energysolutions, Inc. 10
#20 Curium US Llc 9

About This Class

CPC subclass G21F belongs to class G21.

1,599 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 G21F 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 G21F assignees by class footprint. Bubble size = patents in G21F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 G21F assignees by class footprint. Bubble size = patents in G21F. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 51015202530 050100150 Patents in G21F Avg claims / patent (company-wide) Holtec InternationalWestinghouse ElectricKorea Atomic Energy R…XylecoKorea Hydro & Nuclear…Deep IsolationTn InternationalGe-hitachi Nuclear En…FramatomeHitachi-ge Nuclear En…Bracco DiagnosticsSavannah River Nuclea…ArevaRadux Devices
Top 14 G21F assignees by class footprint. Bubble size = patents in G21F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class G21F?
CPC subclass G21F covers PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR. It belongs to CPC class G21 (NUCLEAR PHYSICS; NUCLEAR ENGINEERING), with 1,599 US utility patents granted since 2015.
How many patents have been filed in G21F?
1,599 US utility patents were granted in CPC subclass G21F between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in G21F?
Holtec International leads G21F with 111 patents, making it the most active assignee in this technology area.
How is patent data for G21F 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., G21) is a broad technology category. Subclasses like G21F 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.