PlainPatent

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 filing trajectory.

3,110
US patents granted
H03
Parent CPC class
20
Active assignees
+2%
5-yr velocity

The verdict

Generation OF Oscillations ranks #308 of 670 CPC technology areas - 3,110 US patents granted since 2015, with filing up 2% over five years.

#308
of 670 CPC technology areas
3,110
US patents granted, 2015–2025
Seiko Epson
leading assignee (394)
+2%
filing velocity, last 5 yrs
Top assignee: Seiko Epson Corporation (394 patents)

CPC subclass H03B - 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 - covers 3,110 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class H03 (ELECTRONIC CIRCUITRY). See our CPC classification guide for how the system works.

The competitive landscape in H03B is shaped by 20 distinct companies actively filing in this space. Seiko Epson Corporation leads with 394 patents, followed by Silicon Laboratories Inc. at 46 grants and Nihon Dempa Kogyo Co., Ltd. at 44.

Filing activity in H03B is up 2% 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 H03B innovation accelerating?

US utility-patent grants per year in H03B, 2015–2025 - recent five years are up 2% versus 2015–2019.

100200300400500 20152016201720182019202020212022202320242025 142

Who leads H03B?

The 12 most active assignees in 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 - wider bars mean more grants

patents

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.

Source USPTO PatentsView, granted utility patents As of 2015–2025 grant years
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

About This Class

CPC subclass H03B belongs to class H03.

3,110 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 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).

Top 14 H03B assignees by class footprint. Bubble size = patents in H03B. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 -1000100200300400500 Patents in H03B Avg claims / patent (company-wide) Seiko EpsonSilicon LaboratoriesNihon Dempa KogyoSitimeIntegrated Device Tec…DaishinkuXilinxLapis SemiconductorRambusInnophaseKaikutekNordic Semiconductor…National Chi Nan Univ…Maxlinear Asia Singap…
Top 14 H03B assignees by class footprint. Bubble size = patents in H03B. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class H03B?
CPC subclass H03B covers 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. It belongs to CPC class H03 (ELECTRONIC CIRCUITRY), with 3,110 US utility patents granted since 2015.
How many patents have been filed in H03B?
3,110 US utility patents were granted in CPC subclass H03B between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in H03B?
Seiko Epson Corporation leads H03B with 394 patents, making it the most active assignee in this technology area.
How is patent data for H03B 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., H03) is a broad technology category. Subclasses like H03B 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.