CPC technology class · H03

H03B - Generation Of Oscillations

Generation of oscillations, directly or by frequency-changing, by circuits employing active elements which operate in a non-switching manner; generation of noise by such circuits. 3,110 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

3,110
US patents granted: #7/10
in H03: 3.3%
H03 class share: -7%
5-yr velocity

The verdict

According to USPTO PatentsView, Generation Of Oscillations ranks #308 of 670 CPC technology areas - 3,110 US patents granted since 2015, with recorded grant volume down 7% over five years.

#308
of 670 CPC technology areas: 3,110
US patents granted, 2015–2025: Seiko Epson
leading assignee (394): -7%
grant velocity, last 5 yrs

How H03B's grant cadence moved

Between 2020–2024, H03B recorded 1,385 grants versus 1,492 in 2015–2019 (-7% equal-window velocity). Across complete years, output peaked in 2020 at 429 grants and bottomed in 2024 at 181 (+137% peak-over-trough). Lead assignee Seiko Epson Corporation holds 12.7% of the class ; the top three share 15.6%.

Leaderboard read

H03B concentration, lead at 12.7%

Seiko Epson Corporation leads this historical grant record at 12.7% of H03B - foreign corporation assignees hold 74% of class grants (750 of 1,010). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 12.7%
Top three share: 15.6%
Lead over #2: 348

Where H03B sits inside H03

Among 10 subclasses in H03 (Electronic Circuitry), H03B ranks #7 and holds 3.3% 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 H03D 1,165 H03J 659

Rising assignees active in H03B

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 · 8 in H03B
#2 TXC Corporation 2.50x 4 → 10 company-wide · 10 in H03B
#3 Nordic Semiconductor ASA 2.29x 42 → 96 company-wide · 10 in H03B
#4 Macom Technology Solutions Holdings, Inc. 1.79x 66 → 118 company-wide · 5 in H03B
#5 SiTime Corporation 1.51x 33 → 50 company-wide · 26 in H03B

H03B grants by year, peak 2020 (429)

US utility-patent grants per year in H03B, 2015–2025 - recent five years are down 7% versus 2015–2019.

Seiko Epson

394
Silicon Laboratories

46
Nihon Dempa Kogyo

44
Sitime

26
Integrated Device…

16
Daishinku

16
Xilinx

13
Lapis Semiconductor

13
Rambus

12
Innophase

12
Kaikutek

11
Nordic Semiconductor…

10

What this shows Seiko Epson is the most active filer in H03B, holding 394 of the 3,110 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 H03B
Rank	Company	Patents in H03B
#1	Seiko Epson Corporation	394
#2	Silicon Laboratories Inc.	46
#3	Nihon Dempa Kogyo Co., Ltd.	44
#4	SiTime Corporation	26
#5	Integrated Device Technology, Inc.	16
#6	Daishinku Corporation	16
#7	Xilinx, Inc.	13
#8	Lapis Semiconductor Co., Ltd.	13
#9	Rambus Inc.	12
#10	Innophase, Inc.	12
#11	Kaikutek Inc.	11
#12	Nordic Semiconductor ASA	10
#13	National Chi Nan University	10
#14	Maxlinear Asia Singapore PTE Ltd	10
#15	TXC Corporation	10
#16	Piedek Technical Laboratory	10
#17	Asahi Kasei Microdevices Corporation	9
#18	Wiliot, Ltd.	8
#19	SII Crystal Technology Inc.	8
#20	MaxLinear, Inc.	7

Footprint here vs. claim strategy

Each dot is a leading H03B 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 H03B assignees by class footprint. Bubble size = patents in H03B. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near H03B's 3,110-grant footprint

Nationwide nearest neighbors for H03B (#308 of 670 by volume ; lead share 12.7%) - not the H03 parent-class siblings above.

Nearest by grant volume

C12R 3,107 D06M 3,083 C22B 3,163 B62B 3,039

Nearest by lead-assignee share

B25F 12.7% C21D 12.6% A46B 12.7% F02K 12.8%

Questions about H03B

Which company holds the most patents in H03B?

Seiko Epson Corporation leads H03B with 394 patents (12.7% of the subclass). By PatentsView assignee type, foreign corporations account for 74% of class grants.

Which H03B assignees grew fastest recently?

Among assignees with ≥5 grants in H03B, Wiliot, Ltd. shows the highest company-wide grant multiple (2.78x: 9 grants in 2019–2021 → 25 in 2022–2024) while holding 8 patents in this subclass. Growth is company-wide, not class-only.

How does H03B compare inside parent class H03?

Inside H03 (Electronic Circuitry), H03B ranks #7 of 10 subclasses by grant volume and holds 3.3% of the parent class total. The largest sibling is H03K (30,872 grants).

What to do with this data

H03B in context - here's where to go next.

Seiko Epson Corporation leads H03B with 394 grants in this class. See full portfolio
H03B ranks #308 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 - H03B figures are USPTO PatentsView granted-utility totals for this subclass (3,110 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.