PlainPatent

CPC technology class · F21

F21L - Lighting Devices OR Systems Thereof

Lighting devices or systems thereof, being portable or specially adapted for transportation. 1,327 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

1,327
US patents granted
F21
Parent CPC class
20
Active assignees
+17%
5-yr velocity

The verdict

Lighting Devices OR Systems Thereof ranks #419 of 670 CPC technology areas - 1,327 US patents granted since 2015, with filing up 17% over five years.

#419
of 670 CPC technology areas
1,327
US patents granted, 2015–2025
Milwaukee Electric To…
leading assignee (94)
+17%
filing velocity, last 5 yrs
Top assignee: Milwaukee Electric Tool Corporation (94 patents)

CPC subclass F21L - LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION - covers 1,327 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class F21 (LIGHTING). See our CPC classification guide for how the system works.

The competitive landscape in F21L is shaped by 20 distinct companies actively filing in this space. Milwaukee Electric Tool Corporation leads with 94 patents, followed by Streamlight, Inc. at 63 grants and MAG Instrument, Inc at 53.

Filing activity in F21L is up 17% 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 F21L innovation accelerating?

US utility-patent grants per year in F21L, 2015–2025 - recent five years are up 17% versus 2015–2019.

80100120140160 20152016201720182019202020212022202320242025 88

Who leads F21L?

The 12 most active assignees in LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION - wider bars mean more grants

patents

What this shows Milwaukee Electric To… is the most active filer in F21L, holding 94 of the 1,327 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 F21L
Rank Company Patents in F21L
#1 Milwaukee Electric Tool Corporation 94
#2 Streamlight, Inc. 63
#3 MAG Instrument, Inc 53
#4 Promier Products Inc. 22
#5 Luminaid LAB, Llc 19
#6 Alliance Sports Group, L.p. 16
#7 Walter R. Tucker Enterprises, Ltd 14
#8 Mpowerd Inc. 14
#9 Emissive Energy Corp. 13
#10 Designs For Vision, Inc. 12
#11 LB Marketing, Inc. 12
#12 Zedel 11
#13 Integra Lifesciences Corporation 11
#14 Ningbo Futai Electric Limited 10
#15 FUSE, Llc 10
#16 Coast Cutlery Co. 9
#17 Riverpoint Medical, Llc 9
#18 Infinity X1 Llc 9
#19 E. Mishan & SONS, Inc. 8
#20 Nite Ize, Inc. 8

About This Class

CPC subclass F21L belongs to class F21.

1,327 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 F21L 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 F21L assignees by class footprint. Bubble size = patents in F21L. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 F21L assignees by class footprint. Bubble size = patents in F21L. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 0510152025 020406080100 Patents in F21L Avg claims / patent (company-wide) Milwaukee Electric To…StreamlightMag InstrumentPromier ProductsLuminaid LabAlliance Sports GroupWalter R Tucker Enter…MpowerdEmissive EnergyDesigns for VisionLb MarketingZedelIntegra LifesciencesNingbo Futai Electric
Top 14 F21L assignees by class footprint. Bubble size = patents in F21L. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class F21L?
CPC subclass F21L covers LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION. It belongs to CPC class F21 (LIGHTING), with 1,327 US utility patents granted since 2015.
How many patents have been filed in F21L?
1,327 US utility patents were granted in CPC subclass F21L between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F21L?
Milwaukee Electric Tool Corporation leads F21L with 94 patents, making it the most active assignee in this technology area.
How is patent data for F21L 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., F21) is a broad technology category. Subclasses like F21L 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.