ClassID:

118923

C21D1/22 - CPC Classification

Classification description:

General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering; Hardening ; Quenching with or without subsequent tempering by interrupted quenching Martempering

Recent Application in this class:
#1
20250333824
2025-10-30

STEEL ALLOY AND METHOD OF MANUFACTURE EXHIBITING ENHANCED COMBINATION OF HIGH TEMPERATURE STRENGTH, OXIDATION RESISTANCE, AND THERMAL CONDUCTIVITY

#2
20250271053
2025-08-28

METHOD OF MAKING AN INTERAXLE DIFFERENTIAL UNIT AND AN ANNULAR CASE

#3
20250215545
2025-07-03

COLD-ROLLED STEEL SHEET

#4
20240360528
2024-10-31

QUENCHING APPARATUS, QUENCHING METHOD, AND METHOD OF MANUFACTURING METAL SHEET

#5
20240263265
2024-08-08

HIGH STRENGTH STEEL PRODUCTS AND ANNEALING PROCESSES FOR MAKING THE SAME

#6
20240229201
2024-07-11

STEEL SHEET, MEMBER, AND METHOD FOR PRODUCING THEM

#7
20240218475
2024-07-04

METHOD FOR MANUFACTURING A HIGH STRENGTH STEEL PLATE AND HIGH STRENGTH STEEL PLATE

#8
20240167134
2024-05-23

STEEL ALLOY AND METHOD OF MANUFACTURE EXHIBITING ENHANCED COMBINATION OF HIGH TEMPERATURE STRENGTH, OXIDATION RESISTANCE, AND THERMAL CONDUCTIVITY

#9
20240124950
2024-04-18

METHOD FOR HEAT TREATING A STEEL COMPONENT

#10
20240002994
2024-01-04

MODIFIED HOT-DIP GALVANIZE COATINGS WITH LOW LIQUIDUS TEMPERATURE, METHODS OF MAKING AND USING THE SAME

#11
20230271635
2023-08-31

RAILWAY AXLE

#12
20230001466
2023-01-05

HOT-STAMPING FORMED BODY

#13
20220290750
2022-09-15

METHOD OF MAKING AN INTERAXLE DIFFERENTIAL UNIT AND AN ANNULAR CASE

#14
20220251676
2022-08-11

HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME

#15
20220064745
2022-03-03

High-strength structural steel having excellent cold bendability, and manufacturing method therefor

#16
20220010397
2022-01-13

Steel sheet and method for producing the same

#17
20210371947
2021-12-02

ALLOYED STEEL AND QUENCHED AND TEMPERED STEEL

#18
20210340643
2021-11-04

Hot-press molding method and hot-press molded product

#19
20210230711
2021-07-29

Heat treatment method and heat treatment apparatus

#20
20210180172
2021-06-17

MODIFIED HOT-DIP GALVANIZE COATINGS WITH LOW LIQUIDUS TEMPERATURE, METHODS OF MAKING AND USING THE SAME

#21
20210164069
2021-06-03

STEEL PLATE MEMBER AND METHOD OF PRODUCING THE SAME

#22
20210062288
2021-03-04

High-strength cold-rolled steel sheet and manufacturing method therefor

#23
20210047707
2021-02-18

Method for producing an ultra high strength galvannealed steel sheet and obtained galvannealed steel sheet

#24
20210032713
2021-02-04

METHOD OF PRODUCTION OF STEEL PARTS BY QUENCHING WITH TEMPERATURE EQUALIZATION AT MS

#25
20200407814
2020-12-31

MARTENSITIC STAINLESS STEEL SEAMLESS PIPE FOR OIL COUNTRY TUBULAR GOODS, AND METHOD FOR MANUFACTURING SAME

#26
20200332397
2020-10-22

Steel sheet

#27
20200263272
2020-08-20

Method of producing press-hardened and coated steel parts at a high productivity rate

#28
20200263266
2020-08-20

Method of manufacturing a tubular product and tubular product

#29
20200190616
2020-06-18

SLIDING CAMSHAFT AND METHOD OF MANUFACTURING

#30
20200095651
2020-03-26

HIGH-STRENGTH COLD-ROLLED STEEL SHEET, HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET, AND HIGH-STRENGTH HOT-DIP GALVANNEALED STEEL SHEET EXCELLENT IN FORMABILITY AND SHAPE FIXABILITY, AND METHODS FOR MANUFACTURING THEM

#31
20200080164
2020-03-12

High strength precipitation hardening stainless steel alloy and article made therefrom

#32
20200040422
2020-02-06

High strength annealed steel products and annealing processes for making the same

#33
20190390291
2019-12-26

ANNEALING PROCESSES FOR MAKING HIGH STRENGTH STEEL PRODUCTS

#34
20190360064
2019-11-28

HIGH PERFORMANCE MATERIAL FOR COILED TUBING APPLICATIONS AND THE METHOD OF PRODUCING THE SAME

#35
20190360063
2019-11-28

High performance material for coiled tubing applications and the method of producing the same

#36
20190338388
2019-11-07

Tempered and coated steel sheet having excellent formability and a method of manufacturing the same

#37
20190211415
2019-07-11

NIOBIUM AND CHROMIUM LOW ALLOY CARBON STEEL FOR HIGH WEAR RESISTANT AUTOMOTIVE CHAIN LINK PLATES

#38
20190185959
2019-06-20

Method of producing press-hardened and coated steel parts at a high productivity rate

#39
20190153560
2019-05-23

Method of producing press-hardened and coated steel parts at a high productivity rate

#40
20190126400
2019-05-02

Press hardened steel with tailored properties

#41
20190119774
2019-04-25

FLAT STEEL PRODUCT AND METHOD FOR THE PRODUCTION THEREOF

#42
20190062864
2019-02-28

High strength annealed steel products

#43
20190039111
2019-02-07

PRODUCT MOLDING METHOD AND APPARATUS AND PRODUCT

#44
20190010574
2019-01-10

Galvannealed steel sheet

#45
20190003005
2019-01-03

Method for producing a steel sheet having improved strength, ductility and formability

#46
20180229294
2018-08-16

Steel for molds and molding tool

#47
20180223384
2018-08-09

High performance material for coiled tubing applications and the method of producing the same

#48
20180171429
2018-06-21

Heat-treated steel sheet member and method for producing the same

#49
20180135147
2018-05-17

Hot-press molding method and hot-press molded product

#50
20180051353
2018-02-22

HIGH PERFORMANCE MATERIAL FOR COILED TUBING APPLICATIONS AND THE METHOD OF PRODUCING THE SAME

#51
20170349987
2017-12-07

High-strength steel with yield strength of 800 MPa and production method therefor

#52
20170335421
2017-11-23

High performance material for coiled tubing applications and the method of producing the same

#53
20170327924
2017-11-16

High strength steel products and annealing processes for making the same

#54
20170275715
2017-09-28

High-strength seamless steel pipe for oil country tubular goods and method of producing the same

#55
20170268078
2017-09-21

Method of producing press-hardened and coated steel parts at a high productivity rate

#56
20170226606
2017-08-10

Method of manufacturing a sliding camshaft

#57
20170130291
2017-05-11

Method for producing a high strength steel piece

#58
20170096722
2017-04-06

High-strength seamless stainless steel pipe for oil country tubular goods and method for manufacturing the same

#59
20170051378
2017-02-23

High-strength cold rolled steel sheet having excellent ductility, hot-dip galvanized steel sheet and method for manufacturing same

#60
20170037488
2017-02-09

High-strength hot-dip galvanized steel sheet and method for producing the same

#61
20170016086
2017-01-19

Method of producing press-hardened and coated steel parts at a high productivity rate

#62
20170008004
2017-01-12

GRINDING MEDIA FABRICATION

#63
20160369369
2016-12-22

High-strength cold-rolled steel sheet and method for manufacturing the same (as amended)

#64
20160326617
2016-11-10

Martensitic Cr-containing steel and oil country tubular goods

#65
20160312653
2016-10-27

Nanostructured ferritic alloy components and related articles

#66
20160178093
2016-06-23

Cold-rolled narrow strip in the form of flat wire or profiled elements made of a high-strength steel

#67
20160153525
2016-06-02

Sliding member, chain link, and chain comprising said link

#68
20150368729
2015-12-24

Method for the production of high-wear-resistance martensitic cast steel and steel with said characteristics

#69
20150354022
2015-12-10

Stainless steel seamless pipe for oil well use and method for manufacturing the same

#70
20150299834
2015-10-22

High-strength steel sheet and method for producing the same

#71
20150292052
2015-10-15

High-strength spring steel wire with excellent hydrogen embrittlement resistance, manufacturing process therefor, and high-strength spring

#72
20150259771
2015-09-17

High strength low alloy steel and method of manufacturing

#73
20150240930
2015-08-27

Method of manufacturing a flexible externally toothed gear for strain wave gearing

#74
20150205230
2015-07-23

Conductive belt and electrophotographic apparatus

#75
20150147589
2015-05-28

Rolled steel that hardens by means of precipitation after hot-forming and/or quenching with a tool having very high strength and ductility, and method for manufacturing same

#76
20150101713
2015-04-16

Method and apparatus for treating a steel article

#77
20150101712
2015-04-16

Method for manufacturing high-strength cold-rolled steel sheet with outstanding workability

#78
20140311205
2014-10-23

Method and forming tool for hot forming and press hardening workpieces of sheet steel, in particular galvanized workpieces of sheet steel

#79
20140272448
2014-09-18

High performance material for coiled tubing applications and the method of producing the same

#80
20140096876
2014-04-10

Methods for manufacturing a high-strength press-formed member

#81
20130180628
2013-07-18

Martensitic stainless steel machineability optimization

#82
20130087253
2013-04-11

High strength steel sheet and method for manufacturing the same

#83
20130048161
2013-02-28

High strength press-formed member and method for manufacturing the same

#84
20130037181
2013-02-14

INTEGRATED PROCESSING METHOD FOR SHEET STEEL HOT STAMPING AND HEAT TREATMENT

#85
20130014863
2013-01-17

METHOD OF MAGNETICALLY PROCESSING AN IRON-CARBON ALLOY

#86
20130008567
2013-01-10

Heat treatment method

#87
20130000788
2013-01-03

Method for manufacturing base material for wave gear

#88
20120273089
2012-11-01

Seat structural component tailored for strength

#89
20120225761
2012-09-06

Forged roll meeting the requirements of the cold rolling industry and a method for production of such a roll

#90
20120134872
2012-05-31

ABRASION RESISTANT STEEL, METHOD OF MANUFACTURING AN ABRASION RESISTANT STEEL AND ARTICLES MADE THEREFROM

#91
20110249995
2011-10-13

Conductive belt and electrophotographic apparatus

#92
20100296764
2010-11-25

Method of heat treating a steel bearing component

#93
20100276038
2010-11-04

MARTENSITIC STAINLESS STEEL, METHOD FOR MAKING PARTS FROM SAID STEEL AND PARTS THUS MADE

#94
20100193087
2010-08-05

MARTENSITIC STAINLESS STEEL SEAMLESS PIPE FOR OIL COUNTRY TUBULAR GOODS AND METHOD FOR MANUFACTURING THE SAME

#95
20090199930
2009-08-13

Secondary-hardening gear steel

#96
20090044882
2009-02-19

Oil well pipe for expandable tubular applications excellent in post-expansion toughness and method of manufacturing the same

#97
20080302501
2008-12-11

Steel for Hot Tooling, and Part Produced From Said Steel, Method for the Production Thereof, and Uses of the Same

#98
20080251165
2008-10-16

Heat treatment system for a composite turbine engine component

#99
20080197546
2008-08-21

Metal heat treatment system hot-gas quenching apparatus and hot-gas heat treatment system

#100
20080053574
2008-03-06

Cold work steel and manufacturing method thereof

#101
20060086442
2006-04-27

Hot gas quenching devices, and hot gas heat treating system

#102
20060011274
2006-01-19

Method for producing steel with retained austenite