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 grant trajectory.

Compiled by PlainPatent · May 15, 2026

1,327
US patents granted: #6/6
in F21: 1.8%
F21 class share: +3%
5-yr velocity

The verdict

According to USPTO PatentsView, Lighting Devices Or Systems Thereof ranks #420 of 670 CPC technology areas - 1,327 US patents granted since 2015, with recorded grant volume up 3% over five years.

#420
of 670 CPC technology areas: 1,327
US patents granted, 2015–2025: Milwaukee Electric Tool
leading assignee (94): +3%
grant velocity, last 5 yrs

How F21L's grant cadence moved

Between 2020–2024, F21L recorded 620 grants versus 603 in 2015–2019 (+3% equal-window velocity). Across complete years, output peaked in 2019 at 143 grants and bottomed in 2015 at 105 (+36% peak-over-trough). Lead assignee Milwaukee Electric Tool Corporation holds 7.1% of the class ; the top three share 15.8%.

Leaderboard read

F21L concentration, lead at 7.1%

Milwaukee Electric Tool Corporation leads this historical grant record at 7.1% of F21L - us corporation assignees hold 80% of class grants (669 of 835). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 7.1%
Top three share: 15.8%
Lead over #2: 31

Where F21L sits inside F21

Among 6 subclasses in F21 (Lighting), F21L ranks #6 and holds 1.8% of the parent class's 72,153 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F21V 23,679 F21Y 17,865 F21S 15,705 F21K 7,021 F21W 6,556

Rising assignees active in F21L

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 Mpowerd Inc. 5.50x 2 → 11 company-wide · 14 in F21L
#2 LB Marketing, Inc. 4.50x 2 → 9 company-wide · 12 in F21L
#3 Infinity X1 LLC 3.00x 0 → 3 company-wide · 9 in F21L
#4 LuminAID LAB, LLC 2.60x 5 → 13 company-wide · 19 in F21L
#5 West Coast Imports, Inc. 2.11x 9 → 19 company-wide · 5 in F21L

F21L grants by year, peak 2019 (143)

US utility-patent grants per year in F21L, 2015–2025 - recent five years are up 3% versus 2015–2019.

Milwaukee Electric…

94
Streamlight

63
Mag Instrument

53
Promier Products

22
Luminaid Lab

19
Alliance Sports Group

16
Walter R Tucker…

14
Mpowerd

14
Emissive Energy

13
Designs for Vision

12
Lb Marketing

12
Zedel

11

What this shows Milwaukee Electric… 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.

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

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).

Classes near F21L's 1,327-grant footprint

Nationwide nearest neighbors for F21L (#420 of 670 by volume ; lead share 7.1%) - not the F21 parent-class siblings above.

Nearest by grant volume

B27B 1,327 B28D 1,321 A22C 1,343 B66D 1,354

Nearest by lead-assignee share

B60Q 7.1% F23D 7.1% F24F 7.1% A61N 7.1%

Questions about F21L

Which company holds the most patents in F21L?

Milwaukee Electric Tool Corporation leads F21L with 94 patents (7.1% of the subclass). By PatentsView assignee type, us corporations account for 80% of class grants.

Which F21L assignees grew fastest recently?

Among assignees with ≥5 grants in F21L, Mpowerd Inc. shows the highest company-wide grant multiple (5.50x: 2 grants in 2019–2021 → 11 in 2022–2024) while holding 14 patents in this subclass. Growth is company-wide, not class-only.

How does F21L compare inside parent class F21?

Inside F21 (Lighting), F21L ranks #6 of 6 subclasses by grant volume and holds 1.8% of the parent class total. The largest sibling is F21V (23,679 grants).

What to do with this data

F21L in context - here's where to go next.

Milwaukee Electric Tool Corporation leads F21L with 94 grants in this class. See full portfolio
F21L ranks #420 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class F21, the largest sibling subclass is F21V with 23,679 grants. Explore F21V

Figures reflect USPTO PatentsView grant data through 2026-05-15; pending applications not yet granted are not counted.

Methodology - F21L figures are USPTO PatentsView granted-utility totals for this subclass (1,327 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.