CPC technology class · D01

D01F - Chemical Features In The Manufacture Of Artificial Filaments

Chemical features in the manufacture of artificial filaments, threads, fibres, bristles or ribbons; apparatus specially adapted for the manufacture of carbon filaments. 3,867 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

3,867
US patents granted: #1/6
in D01: 51.1%
D01 class share: +20%
5-yr velocity

The verdict

According to USPTO PatentsView, Chemical Features In The Manufacture Of Artificial Filaments ranks #277 of 670 CPC technology areas - 3,867 US patents granted since 2015, with recorded grant volume up 20% over five years.

#277
of 670 CPC technology areas: 3,867
US patents granted, 2015–2025: The Procter & Gamble
leading assignee (128): +20%
grant velocity, last 5 yrs

How D01F's grant cadence moved

Between 2020–2024, D01F recorded 1,793 grants versus 1,499 in 2015–2019 (+20% equal-window velocity). Across complete years, output peaked in 2024 at 419 grants and bottomed in 2015 at 266 (+58% peak-over-trough). Lead assignee Toray Industries, Inc. holds 2.6% of the class ; the top three share 4.8%.

Leaderboard read

D01F concentration, lead at 2.6%

Toray Industries, Inc. leads this historical grant record at 2.6% of D01F - foreign corporation assignees hold 59% of class grants (858 of 1,463). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 2.6%
Top three share: 4.8%
Lead over #2: 59

Where D01F sits inside D01

Among 6 subclasses in D01 (Natural OR Man-made Threads OR FIBRES; Spinning), D01F ranks #1 and holds 51.1% of the parent class's 7,563 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

D01D 2,869 D01H 375 D01G 292 D01B 91 D01C 69

Rising assignees active in D01F

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 Takemoto Yushi Kabushiki Kaisha 16x 1 → 16 company-wide · 7 in D01F
#2 Bestee Material (TSINGTAO) Co., Ltd. 6.00x 1 → 6 company-wide · 7 in D01F
#3 C2cnt LLC 5.40x 5 → 27 company-wide · 15 in D01F
#4 Octet Medical, Inc. 5.00x 1 → 5 company-wide · 5 in D01F
#5 Montefibre Mae Technologies S.r.l. 4.00x 1 → 4 company-wide · 6 in D01F

D01F grants by year, peak 2024 (419)

US utility-patent grants per year in D01F, 2015–2025 - recent five years are up 20% versus 2015–2019.

Toray Industries

102
Lenzing Aktiengesellsc…

43
Aladdin Manufacturing

42
Kolon Industries

36
Jiangsu Hengli…

31
Kimberly-clark…

30
Teijin

26
Taiwan Textile…

23
Tepha

19
Es Fibervisions

18
Spiber

17
Carbon Holdings…

16

What this shows The Procter & Gamble is the most active filer in D01F, holding 128 of the 3,867 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 D01F
Rank	Company	Patents in D01F
#1	Toray Industries, Inc.	102
#2	Lenzing Aktiengesellschaft	43
#3	Aladdin Manufacturing Corporation	42
#4	Kolon Industries, Inc.	36
#5	Jiangsu Hengli Chemical Fibre Co., Ltd.	31
#6	Kimberly-Clark Worldwide, Inc.	30
#7	Teijin Limited	26
#8	Taiwan Textile Research Institute	23
#9	Tepha, Inc.	19
#10	ES FiberVisions Co., Ltd.	18
#11	Spiber Inc.	17
#12	Carbon Holdings Intellectual Properties, LLC	16
#13	Acelon Chemicals AND Fiber Corporation	16
#14	Nippon Paper Industries Co., Ltd.	15
#15	C2cnt LLC	15
#16	Cytec Industries, Inc.	14
#17	Polytex Sportbeläge Produktions-GmbH	14
#18	Donaldson Company, Inc.	13
#19	Invista North America S.a.r.l.	13
#20	Dupont Safety & Construction, Inc.	13

Footprint here vs. claim strategy

Each dot is a leading D01F 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 D01F assignees by class footprint. Bubble size = patents in D01F. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near D01F's 3,867-grant footprint

Nationwide nearest neighbors for D01F (#277 of 670 by volume ; lead share 3.3%) - not the D01 parent-class siblings above.

Nearest by grant volume

F24C 3,868 C10N 3,834 H02N 3,799 E04C 3,792

Nearest by lead-assignee share

D03D 3.3% F02G 3.3% C25F 3.3% F41H 3.3%

Questions about D01F

Which company holds the most patents in D01F?

The Procter & Gamble Company leads D01F with 128 patents (2.6% of the subclass). By PatentsView assignee type, foreign corporations account for 59% of class grants.

Which D01F assignees grew fastest recently?

Among assignees with ≥5 grants in D01F, Takemoto Yushi Kabushiki Kaisha shows the highest company-wide grant multiple (16x: 1 grants in 2019–2021 → 16 in 2022–2024) while holding 7 patents in this subclass. Growth is company-wide, not class-only.

How does D01F compare inside parent class D01?

Inside D01 (Natural OR Man-made Threads OR FIBRES; Spinning), D01F ranks #1 of 6 subclasses by grant volume and holds 51.1% of the parent class total. The largest sibling is D01D (2,869 grants).

What to do with this data

D01F in context - here's where to go next.

Toray Industries, Inc. leads D01F with 102 grants in this class. See full portfolio
D01F ranks #277 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class D01, the largest sibling subclass is D01D with 2,869 grants. Explore D01D

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

Methodology - D01F figures are USPTO PatentsView granted-utility totals for this subclass (3,867 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.