PlainPatent

CPC technology class · D01

D01C - Chemical OR Biological Treatment OF Natural Filamentary O…

Chemical or biological treatment of natural filamentary or fibrous material to obtain filaments or fibres for spinning; carbonising rags to recover animal fibres. 69 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

69
US patents granted
D01
Parent CPC class
8
Active assignees
+46%
5-yr velocity

The verdict

Chemical OR Biological Treatment OF Natural Filamentary O… ranks #633 of 670 CPC technology areas - 69 US patents granted since 2015, with filing up 46% over five years.

#633
of 670 CPC technology areas
69
US patents granted, 2015–2025
Modern Meadow
leading assignee (9)
+46%
filing velocity, last 5 yrs
Top assignee: Modern Meadow, Inc. (9 patents)

CPC subclass D01C - CHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES - covers 69 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class D01 (NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING). See our CPC classification guide for how the system works.

The competitive landscape in D01C is shaped by 8 distinct companies actively filing in this space. Modern Meadow, Inc. leads with 9 patents, followed by Thomas Jefferson University at 4 grants and National Agriculture AND FOOD Research Organization at 2.

Filing activity in D01C is up 46% over the past five years versus 2015-2019, a sharp acceleration suggesting an emerging or fast-moving technology area. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is D01C innovation accelerating?

US utility-patent grants per year in D01C, 2015–2025 - recent five years are up 46% versus 2015–2019.

024681012 20152016201720182019202020212022202320242025 5

Who leads D01C?

The 12 most active assignees in CHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES - wider bars mean more grants

patents

What this shows Modern Meadow is the most active filer in D01C, holding 9 of the 69 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 D01C
Rank Company Patents in D01C
#1 Modern Meadow, Inc. 9
#2 Thomas Jefferson University 4
#3 National Agriculture AND FOOD Research Organization 2
#4 Allosource 1
#5 The American University In Cairo 1
#6 Mercer International Inc. 1
#7 Wuhan Textile University 1
#8 Avex, Llc 1

About This Class

CPC subclass D01C belongs to class D01.

69 patents were granted in this class between 2015 and 2025.

8 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 D01C 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 8 D01C assignees by class footprint. Bubble size = patents in D01C. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 8 D01C assignees by class footprint. Bubble size = patents in D01C. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 8 data points (bubble-sized by third dimension). 510152025 0246810 Patents in D01C Avg claims / patent (company-wide) Modern MeadowThomas Jefferson Univ…National Agriculture…AllosourceThe American Universi…Mercer InternationalWuhan Textile Univers…Avex
Top 8 D01C assignees by class footprint. Bubble size = patents in D01C. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class D01C?
CPC subclass D01C covers CHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES. It belongs to CPC class D01 (NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING), with 69 US utility patents granted since 2015.
How many patents have been filed in D01C?
69 US utility patents were granted in CPC subclass D01C between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in D01C?
Modern Meadow, Inc. leads D01C with 9 patents, making it the most active assignee in this technology area.
How is patent data for D01C 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., D01) is a broad technology category. Subclasses like D01C 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.