ClassID:

118756

C21B13/0006 - CPC Classification

Classification description:

Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state

Sub-classes:
Recent Application in this class:
#1
20260131376
2026-05-14

LOW-SULFUR GRANULATED METALLIC UNITS, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#2
20260110493
2026-04-23

HIGH-EFFICIENCY PHOTONIC FURNACES FOR METAL PRODUCTION

#3
20260054312
2026-02-26

TREATING COOLING WATER IN IRON PRODUCTION FACILITIES, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#4
20260048434
2026-02-19

LOW-CARBON GRANULATED METALLIC UNITS, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#5
20260034581
2026-02-05

USE OF RESIDUAL IRON WITHIN GRANULATED METALLIC UNIT PRODUCTION FACILITIES, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#6
20260002225
2026-01-01

SYSTEM FOR PROCESSING RED MUD AND METHOD OF PROCESSING RED MUD

#7
20260001124
2026-01-01

CONTINUOUS GRANULATED METALLIC UNITS PRODUCTION, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#8
20250353076
2025-11-20

USE OF A BASIC OXYGEN FURNACE TO PRODUCE GRANULATED METALLIC UNITS, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#9
20250296062
2025-09-25

PRODUCTION DEVICE FOR CARBON MATERIAL, PRODUCTION SYSTEM FOR CARBON MATERIAL, CARBON CIRCULATION SYSTEM, PRODUCTION METHOD FOR CARBON MATERIAL, AND CARBON CIRCULATION METHOD

#10
20250283185
2025-09-11

METHOD FOR MELTING DIRECT REDUCED IRON, SOLID IRON AND METHOD FOR PRODUCING THE SAME, MATERIAL FOR CIVIL ENGINEERING AND CONSTRUCTION AND METHOD FOR PRODUCING THE SAME, AND SYSTEM FOR MELTING DIRECT REDUCED IRON

#11
20250243554
2025-07-31

METHOD FOR PRODUCING GRAINED IRON, AND GRAINED IRON

#12
20250214026
2025-07-03

SYSTEM FOR CARBON DIOXIDE CAPTURE AND CARBON RECYCLING FOR STEEL MILL

#13
20250197955
2025-06-19

Gasification or Liquefaction of Coal Using a Metal Reactant Alloy Composition

#14
20250137080
2025-05-01

METHOD FOR MANUFACTURING CARBONACEOUS MATERIAL-CONTAINING AGGLOMERATE ORE, AND METHOD FOR MANUFACTURING MOLTEN PIG IRON

#15
20250083980
2025-03-13

TREATING COOLING WATER IN IRON PRODUCTION FACILITIES, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#16
20250083232
2025-03-13

CONTINUOUS GRANULATED METALLIC UNITS PRODUCTION, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#17
20250083231
2025-03-13

USE OF RESIDUAL IRON WITHIN GRANULATED METALLIC UNIT PRODUCTION FACILITIES, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#18
20250083230
2025-03-13

USE OF A BASIC OXYGEN FURNACE TO PRODUCE GRANULATED METALLIC UNITS, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#19
20250083224
2025-03-13

LOW-CARBON GRANULATED METALLIC UNITS, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#20
20250083223
2025-03-13

LOW-SULFUR GRANULATED METALLIC UNITS, AND ASSOCIATED SYSTEMS, DEVICES, AND METHODS

#21
20240392400
2024-11-28

METHOD FOR REFINING MOLTEN IRON

#22
20240392398
2024-11-28

METHOD FOR REFINING MOLTEN IRON

#23
20240376559
2024-11-14

METHOD FOR PRODUCING SLAG HAVING A DESIRED QUALITY

#24
20240352547
2024-10-24

IRON-CONTAINING POWDER DIRECT STEELMAKING DEVICE IN REDUCING ATMOSPHERE AND METHOD FOR USING SAME

#25
20240344155
2024-10-17

METHOD FOR PRODUCING AN IRON MELT

#26
20240327936
2024-10-03

METHOD FOR RECOVERING IRON AND VALUABLE METALS FROM ELECTRIC ARC FURNACE DUST

#27
20240309475
2024-09-19

A METHOD FOR PROCESSING IRON ORE TO OBTAIN STEEL

#28
20240200158
2024-06-20

PROCESS FOR PRODUCING GRAPHENE, OTHER CARBON ALLOTROPES AND MATERIALS

#29
20240191314
2024-06-13

METHOD OF OPERATING AN ELECTRIC ARC FURNACE AND STEEL MILL

#30
20240183614
2024-06-06

HIGH-EFFICIENCY PHOTONIC FURNACES FOR METAL PRODUCTION

#31
20240077256
2024-03-07

HIGH-EFFICIENCY PHOTONIC FURNACES FOR METAL PRODUCTION

#32
20230416854
2023-12-28

SYSTEMS AND METHODS FOR STEEL PRODUCTION

#33
20230257838
2023-08-17

Systems and methods for steel production

#34
20230131754
2023-04-27

Biomass Direct Reduced Iron

#35
20220389536
2022-12-08

PLASMA INDUCED FUMING FURNACE

#36
20220282345
2022-09-08

Gasification or liquefaction of coal using a metal reactant alloy composition

#37
20220213567
2022-07-07

IRONMAKING SYSTEM AND IRONMAKING PROCESS OF TWO-SECTION DOWNDRAFT BED

#38
20210079488
2021-03-18

SYSTEM FOR PROCESSING RED MUD AND METHOD OF PROCESSING RED MUD

#39
20200140966
2020-05-07

Classified reduction gasification iron smelting process of iron ore powder and coal powder in a Y-type entrained flow bed

#40
20200011526
2020-01-09

Burner, method for operating burner, and method for melting and refining cold iron source

#41
20190284651
2019-09-19

Gasification or liquefaction of coal using a metal reactant alloy composition

#42
20190169704
2019-06-06

Reduced iron production method and production apparatus

#43
20180087120
2018-03-29

METHOD AND APPARATUS FOR TREATING IRON-CONTAINED RAW MATERIAL USING BATH SMELTING FURNACE

#44
20170130284
2017-05-11

Products and processes for producing steel alloys using an electric arc furnace

#45
20170081745
2017-03-23

Direct smelting process

#46
20160160303
2016-06-09

Exhaust gas treatment method and exhaust gas treatment facility

#47
20160102374
2016-04-14

Gasification or liquefaction of coal using a metal reactant alloy composition

#48
20160017446
2016-01-21

Cokeless reverberatory furnace for melting iron with separate hearth and melting chamber

#49
20150344983
2015-12-03

Fixed-type electric furnace and molten steel production method

#50
20150259758
2015-09-17

Starting a smelting process

#51
20150176905
2015-06-25

METHOD AND SYSTEM FOR PRODUCING PIG IRON OR FLUID STEEL PRE-PRODUCTS

#52
20150040722
2015-02-12

Iron reduction process and equipment

#53
20150038317
2015-02-05

Direct Smelting Process

#54
20150007697
2015-01-08

Method and device for reducing iron-oxide-containing feedstocks in a high-pressure reducing unit

#55
20140331821
2014-11-13

Producing of pig iron from iron-containing materials

#56
20140318319
2014-10-30

Starting a smelting process

#57
20130333523
2013-12-19

Direct smelting process

#58
20130180361
2013-07-18

Direct smelting process

#59
20130116105
2013-05-09

Direct smelting process

#60
20130101483
2013-04-25

Process for extracting metals from aluminoferrous titanoferrous ores and residues

#61
20120304822
2012-12-06

Gasification or liquefaction of coal using a metal reactant alloy composition

#62
20120036961
2012-02-16

Method and system for producing pig iron or fluid steel pre-products

#63
20120007292
2012-01-12

METHOD AND APPARATUS FOR PRODUCING REDUCED METAL

#64
20120006449
2012-01-12

METHOD FOR PRODUCING METALLIC IRON

#65
20110154951
2011-06-30

Process for producing molten iron

#66
20110011211
2011-01-20

Metallurgical process and plant therefor

#67
20100043599
2010-02-25

Method and device for producing molten material

#68
20100024599
2010-02-04

METHOD AND DEVICE FOR PRODUCING MOLTEN MATERIAL

#69
20090293671
2009-12-03

Electric arc furnace steelmaking

#70
20090230598
2009-09-17

Co-Production of Steel, Titanium and High Grade Oxide

#71
20090183600
2009-07-23

Method for producing metallic iron

#72
20090031859
2009-02-05

Method for producing metallic iron

#73
20090004611
2009-01-01

LOW VELOCITY STAGED COMBUSTION FOR FURNACE ATMOSPHERE CONTROL

#74
20080202061
2008-08-28

Direct smelting plant

#75
20080069763
2008-03-20

Method for manufacturing titanium oxide-containing slag

#76
20070258843
2007-11-08

METALLIC IRON NUGGETS

#77
20070227301
2007-10-04

Metallic iron nuggets

#78
20070209480
2007-09-13

Production of iron using environmentally-benign renewable or recycled reducing agents

#79
20070074644
2007-04-05

Support system for smelting-furnace exhaust-gas stack

#80
20070034055
2007-02-15

Method and apparatus for producing reduced metal

#81
20060248981
2006-11-09

Granular metallic iron

#82
20060169103
2006-08-03

Process for producing particulate iron metal

#83
20060162498
2006-07-27

Direct production of refined metals and alloys

#84
20060096675
2006-05-11

Method for producing metallic iron

#85
20060070495
2006-04-06

Granular metallic iron

#86
20050284262
2005-12-29

Metallurgical vessel

#87
20050028643
2005-02-10

Method for producing titanium oxide containing slag