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CPC technology class · H01

H01T - Spark GAPS

Spark gaps; overvoltage arresters using spark gaps; sparking plugs; corona devices; generating ions to be introduced into non-enclosed gases. 1,823 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

1,823
US patents granted
H01
Parent CPC class
20
Active assignees
-25%
5-yr velocity

The verdict

Spark GAPS ranks #376 of 670 CPC technology areas - 1,823 US patents granted since 2015, with filing down 25% over five years.

#376
of 670 CPC technology areas
1,823
US patents granted, 2015–2025
Ngk Spark Plug
leading assignee (304)
-25%
filing velocity, last 5 yrs
Top assignee: NGK Spark PLUG Co., Ltd. (304 patents)

CPC subclass H01T - SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES - covers 1,823 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 H01T is shaped by 20 distinct companies actively filing in this space. NGK Spark PLUG Co., Ltd. leads with 304 patents, followed by Federal-mogul Ignition Gmbh at 108 grants and Borgwarner Ludwigsburg Gmbh at 27.

Filing activity in H01T is down 25% over the past five years versus 2015-2019, a notable slowdown that may signal a maturing field. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is H01T innovation accelerating?

US utility-patent grants per year in H01T, 2015–2025 - recent five years are down 25% versus 2015–2019.

50100150200250 20152016201720182019202020212022202320242025 76

Who leads H01T?

The 12 most active assignees in SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES - wider bars mean more grants

patents

What this shows Ngk Spark Plug is the most active filer in H01T, holding 304 of the 1,823 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 H01T
Rank Company Patents in H01T
#1 NGK Spark PLUG Co., Ltd. 304
#2 Federal-mogul Ignition Gmbh 108
#3 Borgwarner Ludwigsburg Gmbh 27
#4 Global Plasma Solutions, Inc. 26
#5 Phoenix Contact Gmbh & Co. KG 23
#6 Niterra Co., Ltd. 21
#7 Epcos Ag 20
#8 DEHN + Söhne Gmbh + Co. KG 16
#9 Tenneco Gmbh 15
#10 Imagineering, Inc. 14
#11 DEHN SE 13
#12 FRAM Group IP, Llc 13
#13 TDK Electronics Ag 12
#14 Ionaer International Arizona, Llc 11
#15 Plasma Air International, Inc. 10
#16 Federal-mogul Llc 9
#17 Phoenix, Llc 9
#18 WEST Virginia University 8
#19 SMC Corporation 7
#20 Rosenberger Hochfrequenztechnik Gmbh & Co. KG 7

About This Class

CPC subclass H01T belongs to class H01.

1,823 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 H01T 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 H01T assignees by class footprint. Bubble size = patents in H01T. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 H01T assignees by class footprint. Bubble size = patents in H01T. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 510152025 -1000100200300400 Patents in H01T Avg claims / patent (company-wide) Ngk Spark PlugFederal-mogul IgnitionBorgwarner LudwigsburgGlobal Plasma Solutio…Phoenix Contact & KgNiterraEpcosDehn + SÖHne + KgTennecoImagineeringDehn SeFram Group IpTdkIonaer International…
Top 14 H01T assignees by class footprint. Bubble size = patents in H01T. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class H01T?
CPC subclass H01T covers SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES. It belongs to CPC class H01 (ELECTRIC ELEMENTS), with 1,823 US utility patents granted since 2015.
How many patents have been filed in H01T?
1,823 US utility patents were granted in CPC subclass H01T between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in H01T?
NGK Spark PLUG Co., Ltd. leads H01T with 304 patents, making it the most active assignee in this technology area.
How is patent data for H01T 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 H01T 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.