PlainPatent

CPC technology class · H01

H01J - Electric Discharge Tubes OR Discharge Lamps

Electric discharge tubes or discharge lamps. 24,482 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

24,482
US patents granted
H01
Parent CPC class
20
Active assignees
+14%
5-yr velocity

The verdict

Electric Discharge Tubes OR Discharge Lamps ranks #83 of 670 CPC technology areas - 24,482 US patents granted since 2015, with filing up 14% over five years.

#83
of 670 CPC technology areas
24,482
US patents granted, 2015–2025
Applied Materials
leading assignee (2,108)
+14%
filing velocity, last 5 yrs
Top assignee: Applied Materials, Inc. (2,108 patents)

CPC subclass H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS - covers 24,482 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class H01 (ELECTRIC ELEMENTS). See our CPC classification guide for how the system works.

The competitive landscape in H01J is shaped by 20 distinct companies actively filing in this space. Applied Materials, Inc. leads with 2,108 patents, followed by Tokyo Electron Limited at 1,729 grants and Lam Research Corporation at 1,018.

Filing activity in H01J is up 14% 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 H01J innovation accelerating?

US utility-patent grants per year in H01J, 2015–2025 - recent five years are up 14% versus 2015–2019.

1,6001,8002,0002,2002,4002,600 20152016201720182019202020212022202320242025 1,694

Who leads H01J?

The 12 most active assignees in ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS - wider bars mean more grants

patents

What this shows Applied Materials is the most active filer in H01J, holding 2,108 of the 24,482 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 H01J
Rank Company Patents in H01J
#1 Applied Materials, Inc. 2,108
#2 Tokyo Electron Limited 1,729
#3 Lam Research Corporation 1,018
#4 Taiwan Semiconductor Manufacturing Company Ltd. 537
#5 Hitachi High-technologies Corporation 507
#6 Shimadzu Corporation 496
#7 Micromass UK Limited 487
#8 Hitachi High-tech Corporation 465
#9 FEI Company 423
#10 Nuflare Technology, Inc. 349
#11 Varian Semiconductor Equipment Associates, Inc. 251
#12 ASML Netherlands B.v. 246
#13 DH Technologies Development PTE. Ltd. 244
#14 Thermo Fisher Scientific (bremen) Gmbh 236
#15 Thermo Finnigan Llc 225
#16 JEOL Ltd. 219
#17 ASM IP Holding B.v. 212
#18 Kla-tencor Corporation 181
#19 Hamamatsu Photonics K.k. 174
#20 Purdue Research Foundation 170

About This Class

CPC subclass H01J belongs to class H01.

24,482 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 H01J 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 H01J assignees by class footprint. Bubble size = patents in H01J. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 H01J assignees by class footprint. Bubble size = patents in H01J. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 05001000150020002500 Patents in H01J Avg claims / patent (company-wide) Applied MaterialsTokyo ElectronLam ResearchTaiwan Semiconductor…Hitachi High-ShimadzuMicromass UkHitachi High-techFeiNuflare TechnologyVarian Semiconductor…Asml Netherlands B VDh Development PteThermo Fisher Scienti…
Top 14 H01J assignees by class footprint. Bubble size = patents in H01J. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class H01J?
CPC subclass H01J covers ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS. It belongs to CPC class H01 (ELECTRIC ELEMENTS), with 24,482 US utility patents granted since 2015.
How many patents have been filed in H01J?
24,482 US utility patents were granted in CPC subclass H01J between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in H01J?
Applied Materials, Inc. leads H01J with 2,108 patents, making it the most active assignee in this technology area.
How is patent data for H01J 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., H01) is a broad technology category. Subclasses like H01J 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.