CPC technology class · G21

G21G - Conversion Of Chemical Elements

Conversion of chemical elements; radioactive sources. 629 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

629
US patents granted: #5/8
in G21: 7.0%
G21 class share: +35%
5-yr velocity

The verdict

According to USPTO PatentsView, Conversion Of Chemical Elements ranks #515 of 670 CPC technology areas - 629 US patents granted since 2015, with recorded grant volume up 35% over five years.

#515
of 670 CPC technology areas: 629
US patents granted, 2015–2025: Curium Us
leading assignee (25): +35%
grant velocity, last 5 yrs

How G21G's grant cadence moved

Between 2020–2024, G21G recorded 315 grants versus 234 in 2015–2019 (+35% equal-window velocity). Across complete years, output peaked in 2020 at 75 grants and bottomed in 2015 at 42 (+79% peak-over-trough). Lead assignee Curium US LLC holds 4.0% of the class ; the top three share 9.7%.

Leaderboard read

G21G concentration, lead at 4.0%

Curium US LLC leads this historical grant record at 4.0% of G21G - us corporation assignees hold 61% of class grants (196 of 319). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 4.0%
Top three share: 9.7%
Lead over #2: 6

Where G21G sits inside G21

Among 8 subclasses in G21 (Nuclear PHYSICS; Nuclear Engineering), G21G ranks #5 and holds 7.0% of the parent class's 8,981 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

G21K 3,019 G21C 2,434 G21F 1,599 G21D 744 G21B 372 G21H 179 G21J 5

Rising assignees active in G21G

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 Shine Technologies, LLC 16x 0 → 16 company-wide · 11 in G21G
#2 Bwxt Isotope Technology Group, Inc. 12x 0 → 12 company-wide · 10 in G21G
#3 Jubilant Draximage Inc. 3.00x 4 → 12 company-wide · 9 in G21G
#4 Neutron Therapeutics LLC 2.00x 2 → 4 company-wide · 5 in G21G
#5 Orano MED 1.50x 2 → 3 company-wide · 6 in G21G

G21G grants by year, peak 2020 (75)

US utility-patent grants per year in G21G, 2015–2025 - recent five years are up 35% versus 2015–2019.

Curium Us

25
Bracco Diagnostics

19
Westinghouse Electric

17
Neuboron Medtech

17
Ge-hitachi Nuclear…

15
Qsa Global

13
Shine

11
Bwxt Isotope…

10
Framatome

9
Jubilant Draximage

9
Ge Healthcare

8
Adelphi Technology

8

What this shows Curium Us is the most active filer in G21G, holding 25 of the 629 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 G21G
Rank	Company	Patents in G21G
#1	Curium US LLC	25
#2	Bracco Diagnostics Inc.	19
#3	Westinghouse Electric Company LLC	17
#4	Neuboron Medtech Ltd.	17
#5	GE-Hitachi Nuclear Energy Americas LLC	15
#6	QSA Global Inc.	13
#7	Shine Technologies, LLC	11
#8	Bwxt Isotope Technology Group, Inc.	10
#9	Framatome	9
#10	Jubilant Draximage Inc.	9
#11	GE Healthcare Limited	8
#12	Adelphi Technology, Inc.	8
#13	Mallinckrodt Nuclear Medicine LLC	7
#14	Texas Thorium LLC	7
#15	Ion Beam Applications	6
#16	Orano MED	6
#17	Neutron Therapeutics LLC	5
#18	Mallinckrodt LLC	4
#19	General Atomics	4
#20	Nihon Medi-physics Co., Ltd.	4

Footprint here vs. claim strategy

Each dot is a leading G21G 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 G21G assignees by class footprint. Bubble size = patents in G21G. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near G21G's 629-grant footprint

Nationwide nearest neighbors for G21G (#515 of 670 by volume ; lead share 4.0%) - not the G21 parent-class siblings above.

Nearest by grant volume

G04R 623 B67B 619 D06B 640 E21F 641

Nearest by lead-assignee share

G02B 4.0% F05C 4.0% G05G 4.0% H04Q 4.0%

Questions about G21G

Which company holds the most patents in G21G?

Curium US LLC leads G21G with 25 patents (4.0% of the subclass). By PatentsView assignee type, us corporations account for 61% of class grants.

Which G21G assignees grew fastest recently?

Among assignees with ≥5 grants in G21G, Shine Technologies, LLC shows the highest company-wide grant multiple (16x: 0 grants in 2019–2021 → 16 in 2022–2024) while holding 11 patents in this subclass. Growth is company-wide, not class-only.

How does G21G compare inside parent class G21?

Inside G21 (Nuclear PHYSICS; Nuclear Engineering), G21G ranks #5 of 8 subclasses by grant volume and holds 7.0% of the parent class total. The largest sibling is G21K (3,019 grants).

What to do with this data

G21G in context - here's where to go next.

Curium US LLC leads G21G with 25 grants in this class. See full portfolio
G21G ranks #515 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class G21, the largest sibling subclass is G21K with 3,019 grants. Explore G21K

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

Methodology - G21G figures are USPTO PatentsView granted-utility totals for this subclass (629 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.