PlainPatent

CPC technology class · F27

F27M - Indexing Scheme Relating To Aspects Of The Charges Or Fur…

Indexing scheme relating to aspects of the charges or furnaces, kilns, ovens or retorts. 69 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

69
US patents granted
#3/3
in F27
1.4%
F27 class share
+62%
5-yr velocity

The verdict

According to USPTO PatentsView, Indexing Scheme Relating To Aspects Of The Charges Or Fur… ranks #634 of 670 CPC technology areas - 69 US patents granted since 2015, with recorded grant volume up 62% over five years.

#634
of 670 CPC technology areas
69
US patents granted, 2015–2025
Molten Metal Equipment…
leading assignee (10)
+62%
grant velocity, last 5 yrs

How F27M's grant cadence moved

Between 2020–2024, F27M recorded 34 grants versus 21 in 2015–2019 (+62% equal-window velocity). Across complete years, output peaked in 2022 at 12 grants and bottomed in 2016 at 2 (+500% peak-over-trough). Lead assignee Molten Metal Equipment Innovations, LLC holds 14.5% of the class ; the top three share 23.2%.

Leaderboard read

F27M concentration, lead at 14.5%

Molten Metal Equipment Innovations, LLC leads this historical grant record at 14.5% of F27M - foreign corporation assignees hold 62% of class grants (16 of 26). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
14.5%

10 of 69 grants

Top three share
23.2%

of the class's recorded grants

Lead over #2
6

more grants than Danieli & C. Officine Meccaniche S.P.A.

Where F27M sits inside F27

Among 3 subclasses in F27 (FURNACES; KILNS; OVENS; Retorts), F27M ranks #3 and holds 1.4% of the parent class's 4,893 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F27D 2,695 F27B 2,129

Rising assignees active in F27M

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. #1 Molten Metal Equipment Innovations, LLC 0.77x 26 → 20 company-wide · 10 in F27M

F27M grants by year, peak 2022 (12)

US utility-patent grants per year in F27M, 2015–2025 - recent five years are up 62% versus 2015–2019.

051015 20152016201720182019202020212022202320242025 9

Who leads F27M?

The 12 most active assignees in Indexing Scheme Relating TO Aspects OF THE Charges OR Furnaces, Kilns, Ovens OR Retorts - wider bars mean more grants

patents

What this shows Molten Metal… is the most active filer in F27M, holding 10 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 F27M
Rank Company Patents in F27M
#1 Molten Metal Equipment Innovations, LLC 10
#2 Danieli & C. Officine Meccaniche S.P.A. 4
#3 Heraeus Electro-Nite International N.V. 2
#4 Liaoning Upcera Co., Ltd. 2
#5 Aston Martin Lagonda Limited 1
#6 Leica Biosystems Nussloch GmbH 1
#7 Primetals Technologies Japan, Ltd. 1
#8 IHI Machinery AND Furnace Co., Ltd. 1
#9 Glaston Finland Oy 1
#10 Ten Wing Scientific Co., Ltd. 1
#11 Maerz Ofenbau AG 1
#12 ABP Induction Systems GmbH 1

Footprint here vs. claim strategy

Each dot is a leading F27M 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 12 F27M assignees by class footprint. Bubble size = patents in F27M. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 12 data points (bubble-sized by third dimension). 051015202530 024681012 Patents in F27M Avg claims / patent (company-wide) Molten Metal…Danieli & C Officine…Heraeus Electro-nite…Liaoning UpceraAston Martin LagondaLeica Biosystems…Primetals JapanIhi Machinery And…Glaston Finland OyTen Wing ScientificMaerz OfenbauAbp Induction Systems
Top 12 F27M assignees by class footprint. Bubble size = patents in F27M. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Questions about F27M

Which company holds the most patents in F27M?
Molten Metal Equipment Innovations, LLC leads F27M with 10 patents (14.5% of the subclass). By PatentsView assignee type, foreign corporations account for 62% of class grants.
Which F27M assignees grew fastest recently?
Among assignees with ≥5 grants in F27M, Molten Metal Equipment Innovations, LLC shows the highest company-wide grant multiple (0.77x: 26 grants in 2019–2021 → 20 in 2022–2024) while holding 10 patents in this subclass. Growth is company-wide, not class-only.
How does F27M compare inside parent class F27?
Inside F27 (FURNACES; KILNS; OVENS; Retorts), F27M ranks #3 of 3 subclasses by grant volume and holds 1.4% of the parent class total. The largest sibling is F27D (2,695 grants).

What to do with this data

F27M in context - here's where to go next.

  • Molten Metal Equipment Innovations, LLC leads F27M with 10 grants in this class. See full portfolio
  • F27M ranks #634 of 670 by grant volume among all tracked CPC technology areas. See the ranking
  • Inside parent class F27, the largest sibling subclass is F27D with 2,695 grants. Explore F27D

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

Methodology - F27M figures are USPTO PatentsView granted-utility totals for this subclass (69 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.