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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 filing trajectory.

69
US patents granted
F27
Parent CPC class
12
Active assignees
+105%
5-yr velocity

The verdict

Indexing Scheme Relating TO Aspects OF THE Charges OR Fur… ranks #633 of 670 CPC technology areas - 69 US patents granted since 2015, with filing up 105% over five years.

#633
of 670 CPC technology areas
69
US patents granted, 2015–2025
Molten Metal Equipmen…
leading assignee (10)
+105%
filing velocity, last 5 yrs
Top assignee: Molten Metal Equipment Innovations, Llc (10 patents)

CPC subclass F27M - INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS - covers 69 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class F27 (FURNACES; KILNS; OVENS; RETORTS). See our CPC classification guide for how the system works.

The competitive landscape in F27M is shaped by 12 distinct companies actively filing in this space. Molten Metal Equipment Innovations, Llc leads with 10 patents, followed by Danieli & C. Officine Meccaniche S.p.a. at 4 grants and Heraeus Electro-nite International N.v. at 2.

Filing activity in F27M is up 105% 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 F27M innovation accelerating?

US utility-patent grants per year in F27M, 2015–2025 - recent five years are up 105% 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 Equipmen… 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

About This Class

CPC subclass F27M belongs to class F27.

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

12 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 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).

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 Equipmen…Danieli & C Officine…Heraeus Electro-nite…Liaoning UpceraAston Martin LagondaLeica Biosystems Nuss…Primetals JapanIhi Machinery And Fur…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).

Frequently Asked Questions

What is CPC class F27M?
CPC subclass F27M covers INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS. It belongs to CPC class F27 (FURNACES; KILNS; OVENS; RETORTS), with 69 US utility patents granted since 2015.
How many patents have been filed in F27M?
69 US utility patents were granted in CPC subclass F27M between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F27M?
Molten Metal Equipment Innovations, Llc leads F27M with 10 patents, making it the most active assignee in this technology area.
How is patent data for F27M 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., F27) is a broad technology category. Subclasses like F27M 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.