CPC technology class · D01

D01G - Preliminary Treatment Of Fibres

Preliminary treatment of fibres, e.g. for spinning. 292 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

292
US patents granted: #4/6
in D01: 3.9%
D01 class share: -18%
5-yr velocity

The verdict

According to USPTO PatentsView, Preliminary Treatment Of Fibres ranks #585 of 670 CPC technology areas - 292 US patents granted since 2015, with recorded grant volume down 18% over five years.

#585
of 670 CPC technology areas: 292
US patents granted, 2015–2025: Maschinenfabrik Rieter
leading assignee (26): -18%
grant velocity, last 5 yrs

How D01G's grant cadence moved

Between 2020–2024, D01G recorded 120 grants versus 147 in 2015–2019 (-18% equal-window velocity). Across complete years, output peaked in 2019 at 44 grants and bottomed in 2016 at 16 (+175% peak-over-trough). Lead assignee Maschinenfabrik Rieter AG holds 8.9% of the class ; the top three share 14.0%.

Leaderboard read

D01G concentration, lead at 8.9%

Maschinenfabrik Rieter AG leads this historical grant record at 8.9% of D01G - foreign corporation assignees hold 73% of class grants (95 of 130). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 8.9%
Top three share: 14.0%
Lead over #2: 18

Where D01G sits inside D01

Among 6 subclasses in D01 (Natural OR Man-made Threads OR FIBRES; Spinning), D01G ranks #4 and holds 3.9% 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.

D01F 3,867 D01D 2,869 D01H 375 D01B 91 D01C 69

Rising assignees active in D01G

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 Oskar Dilo Maschinenfabrik KG 1.33x 3 → 4 company-wide · 8 in D01G
#2 Autefa Solutions Germany GMBH 0.82x 11 → 9 company-wide · 6 in D01G
#3 Groz-beckert KG 0.81x 21 → 17 company-wide · 7 in D01G
#4 Maschinenfabrik Rieter AG 0.42x 48 → 20 company-wide · 26 in D01G
#5 Continental Structural Plastics, Inc. 0.20x 15 → 3 company-wide · 5 in D01G

D01G grants by year, peak 2019 (44)

US utility-patent grants per year in D01G, 2015–2025 - recent five years are down 18% versus 2015–2019.

Maschinenfabrik Rieter

26
Oskar Dilo Maschinenfa…

8
Groz-beckert Kg

7
Autefa Solutions…

6
Graf + Cie

6
Continental Structural…

5
Nanocomp

4
Profile Products L L C

4
Uster

4
Deckers Outdoor

3
Convatec

3
Tepha

3

What this shows Maschinenfabrik Rieter is the most active filer in D01G, holding 26 of the 292 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 D01G
Rank	Company	Patents in D01G
#1	Maschinenfabrik Rieter AG	26
#2	Oskar Dilo Maschinenfabrik KG	8
#3	Groz-beckert KG	7
#4	Autefa Solutions Germany GMBH	6
#5	Graf + Cie AG	6
#6	Continental Structural Plastics, Inc.	5
#7	Nanocomp Technologies Inc.	4
#8	Profile Products L.L.C.	4
#9	Uster Technologies AG	4
#10	Deckers Outdoor Corporation	3
#11	Convatec Technologies Inc.	3
#12	Tepha, Inc.	3
#13	Rockwool International A/S	3
#14	Lenzing Aktiengesellschaft	3
#15	Avintiv Specialty Materials Inc.	3
#16	Truetzschler GmbH & Co. KG	3
#17	Tintoria Piana, US Inc.	3
#18	Andritz Asselin-Thibeau	3
#19	Hubei Jinhanjiang Refined Cotton Co., Ltd.	3
#20	Mesdan S.P.A.	3

Footprint here vs. claim strategy

Each dot is a leading D01G 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 D01G assignees by class footprint. Bubble size = patents in D01G. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Questions about D01G

Which company holds the most patents in D01G?

Maschinenfabrik Rieter AG leads D01G with 26 patents (8.9% of the subclass). By PatentsView assignee type, foreign corporations account for 73% of class grants.

Which D01G assignees grew fastest recently?

Among assignees with ≥5 grants in D01G, Oskar Dilo Maschinenfabrik KG shows the highest company-wide grant multiple (1.33x: 3 grants in 2019–2021 → 4 in 2022–2024) while holding 8 patents in this subclass. Growth is company-wide, not class-only.

How does D01G compare inside parent class D01?

Inside D01 (Natural OR Man-made Threads OR FIBRES; Spinning), D01G ranks #4 of 6 subclasses by grant volume and holds 3.9% of the parent class total. The largest sibling is D01F (3,867 grants).

What to do with this data

D01G in context - here's where to go next.

Maschinenfabrik Rieter AG leads D01G with 26 grants in this class. See full portfolio
D01G ranks #585 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class D01, the largest sibling subclass is D01F with 3,867 grants. Explore D01F

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

Methodology - D01G figures are USPTO PatentsView granted-utility totals for this subclass (292 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.