CPC technology class · F23

F23G - Cremation Furnaces

Cremation furnaces; consuming waste products by combustion. 1,073 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

1,073
US patents granted: #6/12
in F23: 7.0%
F23 class share: -17%
5-yr velocity

The verdict

According to USPTO PatentsView, Cremation Furnaces ranks #449 of 670 CPC technology areas - 1,073 US patents granted since 2015, with recorded grant volume down 17% over five years.

#449
of 670 CPC technology areas: 1,073
US patents granted, 2015–2025: Saudi Arabian Oil
leading assignee (24): -17%
grant velocity, last 5 yrs

How F23G's grant cadence moved

Between 2020–2024, F23G recorded 424 grants versus 512 in 2015–2019 (-17% equal-window velocity). Across complete years, output peaked in 2015 at 114 grants and bottomed in 2023 at 79 (+44% peak-over-trough). Lead assignee Edwards Limited holds 1.9% of the class ; the top three share 4.4%.

Leaderboard read

F23G concentration, lead at 1.9%

Edwards Limited leads this historical grant record at 1.9% of F23G - us corporation assignees hold 52% of class grants (199 of 386). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 1.9%
Top three share: 4.4%
Lead over #2: 4

Where F23G sits inside F23

Among 12 subclasses in F23 (Combustion APPARATUS; Combustion Processes), F23G ranks #6 and holds 7.0% of the parent class's 15,279 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F23R 4,138 F23D 2,623 F23N 1,763 F23C 1,571 F23J 1,082 F23L 922 F23K 754 F23M 568

Rising assignees active in F23G

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 Air Burners, Inc. 3.00x 0 → 3 company-wide · 5 in F23G
#2 WM Intellectual Property Holdings, L.L.C. 2.73x 15 → 41 company-wide · 7 in F23G
#3 The Maitland Company, LLC 2.00x 0 → 2 company-wide · 9 in F23G
#4 Weber-Stephen Products LLC 1.64x 52 → 85 company-wide · 9 in F23G
#5 Andritz OY 1.44x 9 → 13 company-wide · 5 in F23G

F23G grants by year, peak 2015 (114)

US utility-patent grants per year in F23G, 2015–2025 - recent five years are down 17% versus 2015–2019.

Edwards

20
Ener-core Power

16
Inentec

11
Mitsubishi Heavy…

11
Weber-stephen Products

9
Biochar Now

9
The Maitland

9
Watlow Electric…

8
Wm Intellectual…

7
Mcalister

7
Taiheiyo Cement

7
Dürr Systems

6

What this shows Saudi Arabian Oil is the most active filer in F23G, holding 24 of the 1,073 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 F23G
Rank	Company	Patents in F23G
#1	Edwards Limited	20
#2	Ener-Core Power, Inc.	16
#3	InEnTec Inc.	11
#4	Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd.	11
#5	Weber-Stephen Products LLC	9
#6	Biochar Now, LLC	9
#7	The Maitland Company, LLC	9
#8	Watlow Electric Manufacturing Company	8
#9	WM Intellectual Property Holdings, L.L.C.	7
#10	McAlister Technologies, LLC	7
#11	Taiheiyo Cement Corporation	7
#12	Dürr Systems AG	6
#13	Clearsign Combustion Corporation	6
#14	Geosyntec Consultants, Inc.	6
#15	Itea S.P.A	6
#16	Andritz OY	5
#17	John Zink Company, LLC	5
#18	Ensyn Renewables, Inc.	5
#19	Suez International	5
#20	API Intellectual Property Holdings, LLC	5

Footprint here vs. claim strategy

Each dot is a leading F23G 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 F23G assignees by class footprint. Bubble size = patents in F23G. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near F23G's 1,073-grant footprint

Nationwide nearest neighbors for F23G (#449 of 670 by volume ; lead share 2.2%) - not the F23 parent-class siblings above.

Nearest by grant volume

A47D 1,075 B67C 1,069 C10K 1,080 F23J 1,082

Nearest by lead-assignee share

C01D 2.3% B02C 2.2% B26D 2.3% C08G 2.3%

Questions about F23G

Which company holds the most patents in F23G?

Saudi Arabian OIL Company leads F23G with 24 patents (1.9% of the subclass). By PatentsView assignee type, us corporations account for 52% of class grants.

Which F23G assignees grew fastest recently?

Among assignees with ≥5 grants in F23G, Air Burners, Inc. shows the highest company-wide grant multiple (3.00x: 0 grants in 2019–2021 → 3 in 2022–2024) while holding 5 patents in this subclass. Growth is company-wide, not class-only.

How does F23G compare inside parent class F23?

Inside F23 (Combustion APPARATUS; Combustion Processes), F23G ranks #6 of 12 subclasses by grant volume and holds 7.0% of the parent class total. The largest sibling is F23R (4,138 grants).

What to do with this data

F23G in context - here's where to go next.

Edwards Limited leads F23G with 20 grants in this class. See full portfolio
F23G ranks #449 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class F23, the largest sibling subclass is F23R with 4,138 grants. Explore F23R

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

Methodology - F23G figures are USPTO PatentsView granted-utility totals for this subclass (1,073 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.