CPC technology class · H03

H03J - Tuning Resonant Circuits

Tuning resonant circuits; selecting resonant circuits. 659 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

659
US patents granted: #9/10
in H03: 0.7%
H03 class share: -51%
5-yr velocity

The verdict

According to USPTO PatentsView, Tuning Resonant Circuits ranks #509 of 670 CPC technology areas - 659 US patents granted since 2015, with recorded grant volume down 51% over five years.

#509
of 670 CPC technology areas: 659
US patents granted, 2015–2025: Rfmicron
leading assignee (33): -51%
grant velocity, last 5 yrs

How H03J's grant cadence moved

Between 2020–2024, H03J recorded 209 grants versus 424 in 2015–2019 (-51% equal-window velocity). Across complete years, output peaked in 2016 at 102 grants and bottomed in 2024 at 19 (+437% peak-over-trough). Lead assignee RFMicron, Inc. holds 5.0% of the class ; the top three share 10.9%.

Leaderboard read

H03J concentration, lead at 5.0%

RFMicron, Inc. leads this historical grant record at 5.0% of H03J - us corporation assignees hold 79% of class grants (142 of 179). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 5.0%
Top three share: 10.9%
Lead over #2: 11

Where H03J sits inside H03

Among 10 subclasses in H03 (Electronic Circuitry), H03J ranks #9 and holds 0.7% of the parent class's 95,387 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

H03K 30,872 H03M 21,338 H03F 14,014 H03H 11,825 H03L 6,701 H03G 5,213 H03B 3,110 H03D 1,165

Rising assignees active in H03J

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 Wiliot, Ltd. 2.78x 9 → 25 company-wide · 5 in H03J
#2 Universal Electronics Inc. 1.42x 97 → 138 company-wide · 8 in H03J
#3 pSemi Corporation 0.93x 276 → 256 company-wide · 22 in H03J
#4 RFMicron, Inc. 0.38x 34 → 13 company-wide · 33 in H03J
#5 Ethertronics, Inc 0.06x 65 → 4 company-wide · 5 in H03J

H03J grants by year, peak 2016 (102)

US utility-patent grants per year in H03J, 2015–2025 - recent five years are down 51% versus 2015–2019.

Rfmicron

33
psemi

22
Peregrine Semiconducto…

17
Universal

8
Short Circuit

7
Achilles Technology…

6
Ethertronics

5
Qualcomm International

5
Wiliot

5
Sirius Xm Radio

4
Adori Labs

4
Shure Acquisition…

3

What this shows Rfmicron is the most active filer in H03J, holding 33 of the 659 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 H03J
Rank	Company	Patents in H03J
#1	RFMicron, Inc.	33
#2	pSemi Corporation	22
#3	Peregrine Semiconductor Corporation	17
#4	Universal Electronics Inc.	8
#5	Short Circuit Technologies LLC	7
#6	Achilles Technology Management Co II, Inc.	6
#7	Ethertronics, Inc	5
#8	Qualcomm Technologies International, Ltd.	5
#9	Wiliot, Ltd.	5
#10	Sirius XM Radio Inc.	4
#11	Adori Labs, Inc.	4
#12	Shure Acquisition Holdings, Inc.	3
#13	Wispry, Inc.	3
#14	Triune IP, LLC	3
#15	Maury Microwave, Inc.	3
#16	Skycross Co., Ltd.	3
#17	Shenzhen Yuejiang Technology Co., Ltd.	3
#18	Kyocera AVX Components (San Diego), Inc.	2
#19	Cambridge Silicon Radio Limited	2
#20	Tesat-Spacecom GmbH & Co. KG	2

Footprint here vs. claim strategy

Each dot is a leading H03J 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 H03J assignees by class footprint. Bubble size = patents in H03J. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near H03J's 659-grant footprint

Nationwide nearest neighbors for H03J (#509 of 670 by volume ; lead share 5.0%) - not the H03 parent-class siblings above.

Nearest by grant volume

B03B 658 A01J 653 E06C 653 A41C 669

Nearest by lead-assignee share

B07C 5.0% C10M 5.0% A21C 5.0% E21D 5.0%

Questions about H03J

Which company holds the most patents in H03J?

RFMicron, Inc. leads H03J with 33 patents (5.0% of the subclass). By PatentsView assignee type, us corporations account for 79% of class grants.

Which H03J assignees grew fastest recently?

Among assignees with ≥5 grants in H03J, Wiliot, Ltd. shows the highest company-wide grant multiple (2.78x: 9 grants in 2019–2021 → 25 in 2022–2024) while holding 5 patents in this subclass. Growth is company-wide, not class-only.

How does H03J compare inside parent class H03?

Inside H03 (Electronic Circuitry), H03J ranks #9 of 10 subclasses by grant volume and holds 0.7% of the parent class total. The largest sibling is H03K (30,872 grants).

What to do with this data

H03J in context - here's where to go next.

RFMicron, Inc. leads H03J with 33 grants in this class. See full portfolio
H03J ranks #509 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class H03, the largest sibling subclass is H03K with 30,872 grants. Explore H03K

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

Methodology - H03J figures are USPTO PatentsView granted-utility totals for this subclass (659 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.