CPC technology class · C05

C05D - Inorganic Fertilisers NOT Covered BY Subclasses C05B

Inorganic fertilisers not covered by subclasses c05b, c05c; fertilisers producing carbon dioxide. 707 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

Compiled byPlainPatent Editorial, US Patent Intelligence Editorial Team · May 15, 2026

707
US patents granted: C05
Parent CPC class: 20
Active assignees: +25%
5-yr velocity

The verdict

Inorganic Fertilisers NOT Covered BY Subclasses C05B ranks #499 of 670 CPC technology areas - 707 US patents granted since 2015, with filing up 25% over five years.

#499
of 670 CPC technology areas: 707
US patents granted, 2015–2025: Cool Planet Energy Sy…
leading assignee (25): +25%
filing velocity, last 5 yrs

Top assignee: Cool Planet Energy System, Inc. (25 patents)

CPC subclass C05D - INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE - covers 707 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class C05 (FERTILISERS; MANUFACTURE THEREOF). See our CPC classification guide for how the system works.

The competitive landscape in C05D is shaped by 20 distinct companies actively filing in this space. Cool Planet Energy System, Inc. leads with 25 patents, followed by The Mosaic Company at 18 grants and Carbon Technology Holdings, Llc at 16.

Filing activity in C05D is up 25% 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 C05D innovation accelerating?

US utility-patent grants per year in C05D, 2015–2025 - recent five years are up 25% versus 2015–2019.

Cool Planet Energy Sy…

25
The Mosaic

18
Carbon Technology Hol…

16
Yara International Asa

11
Profile Products L L C

9
Winfield Solutions

8
Ecovative Design

8
Earth Science Laborat…

8
York Potash

8
Verdesian Life Scienc…

7
Soilgenic

7
Harsco

7

What this shows Cool Planet Energy Sy… is the most active filer in C05D, holding 25 of the 707 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 C05D
Rank	Company	Patents in C05D
#1	Cool Planet Energy System, Inc.	25
#2	The Mosaic Company	18
#3	Carbon Technology Holdings, Llc	16
#4	YARA International ASA	11
#5	Profile Products L.l.c.	9
#6	Winfield Solutions, Llc	8
#7	Ecovative Design Llc	8
#8	Earth Science Laboratories, Inc.	8
#9	YORK Potash Ltd	8
#10	Verdesian Life Sciences U.s., Llc	7
#11	Soilgenic Technologies, Llc	7
#12	Harsco Corporation	7
#13	Specialty Granules Investments Llc	6
#14	LSC Environmental Products, Llc	6
#15	Ralco Nutrition, Inc.	6
#16	Nachurs Alpine Solutions, Corp.	6
#17	Talipot Cool Extract (ip), Llc	6
#18	K+s Aktiengesellschaft	5
#19	Sabic Agri-nutrients Company	5
#20	Innovations FOR World Nutrition, Llc	5

About This Class

CPC subclass C05D belongs to class C05.

707 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 C05D 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 C05D assignees by class footprint. Bubble size = patents in C05D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class C05D?

CPC subclass C05D covers INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE. It belongs to CPC class C05 (FERTILISERS; MANUFACTURE THEREOF), with 707 US utility patents granted since 2015.

How many patents have been filed in C05D?

707 US utility patents were granted in CPC subclass C05D between 2015 and 2025, based on USPTO PatentsView data.

Which company holds the most patents in C05D?

Cool Planet Energy System, Inc. leads C05D with 25 patents, making it the most active assignee in this technology area.

How is patent data for C05D 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., C05) is a broad technology category. Subclasses like C05D 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.