PlainPatent

CPC technology class · F23

F23H - Grates

Grates ; cleaning or raking grates. 49 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

49
US patents granted
#12/12
in F23
0.3%
F23 class share
+25%
5-yr velocity

The verdict

According to USPTO PatentsView, Grates ranks #642 of 670 CPC technology areas - 49 US patents granted since 2015, with recorded grant volume up 25% over five years.

#642
of 670 CPC technology areas
49
US patents granted, 2015–2025
Hitachi Zosen Inova
leading assignee (4)
+25%
grant velocity, last 5 yrs

How F23H's grant cadence moved

Between 2020–2024, F23H recorded 25 grants versus 20 in 2015–2019 (+25% equal-window velocity). Across complete years, output peaked in 2015 at 7 grants and bottomed in 2016 at 1 (+600% peak-over-trough). Lead assignee Hitachi Zosen Inova AG holds 8.2% of the class ; the top three share 22.4%.

Leaderboard read

F23H concentration, lead at 8.2%

Hitachi Zosen Inova AG leads this historical grant record at 8.2% of F23H - foreign corporation assignees hold 56% of class grants (10 of 18). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
8.2%

4 of 49 grants

Top three share
22.4%

of the class's recorded grants

Lead over #2
0

more grants than Martin GmbH für Umwelt- und Energietechik

Where F23H sits inside F23

Among 12 subclasses in F23 (Combustion APPARATUS; Combustion Processes), F23H ranks #12 and holds 0.3% 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 F23G 1,073 F23L 922 F23K 754

F23H grants by year, peak 2015 (7)

US utility-patent grants per year in F23H, 2015–2025 - recent five years are up 25% versus 2015–2019.

02468 20152016201720182019202020212022202320242025 4

Who leads F23H?

The 12 most active assignees in Grates ; Cleaning OR Raking Grates - wider bars mean more grants

patents

What this shows Hitachi Zosen Inova is the most active filer in F23H, holding 4 of the 49 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 F23H
Rank Company Patents in F23H
#1 Hitachi Zosen Inova AG 4
#2 Martin GmbH für Umwelt- und Energietechik 4
#3 Solo Brands, LLC 3
#4 Hestan Commercial Corporation 1
#5 Lamplight Farms Incorporated 1
#6 InEnTec Inc. 1
#7 Dieffenbacher GmbH Maschinen- und Anlagenbau 1
#8 Masterbuilt Manufacturing, LLC 1
#9 Fire Butler, LLC 1
#10 Alite GmbH 1

Footprint here vs. claim strategy

Each dot is a leading F23H 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 10 F23H assignees by class footprint. Bubble size = patents in F23H. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 10 data points (bubble-sized by third dimension). 0510152025 012345 Patents in F23H Avg claims / patent (company-wide) Hitachi Zosen InovaMartin für Umwelt-…Solo BrandsHestan CommercialLamplight Farms…InentecDieffenbacher…Masterbuilt Manufactur…Fire ButlerAlite
Top 10 F23H assignees by class footprint. Bubble size = patents in F23H. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Questions about F23H

Which company holds the most patents in F23H?
Hitachi Zosen Inova AG leads F23H with 4 patents (8.2% of the subclass). By PatentsView assignee type, foreign corporations account for 56% of class grants.
How does F23H compare inside parent class F23?
Inside F23 (Combustion APPARATUS; Combustion Processes), F23H ranks #12 of 12 subclasses by grant volume and holds 0.3% of the parent class total. The largest sibling is F23R (4,138 grants).

What to do with this data

F23H in context - here's where to go next.

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

Methodology - F23H figures are USPTO PatentsView granted-utility totals for this subclass (49 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.