Assignee
NETUREN CO LTD
109 patents
Top patents by PatentIndex Score
US4336081AJun 22, 1982
Process of preparing steel coil spring
NETUREN CO LTD57 citations93
US6080954AJun 27, 2000
Heat treatment method and apparatus using thermal plasma, and heat treated substance produced thereby
NETUREN CO LTD20 citations92
US4665296AMay 12, 1987
Method of and apparatus for igniting a high-frequency torch to create a high-temperature plasma of high purity
NETUREN CO LTD37 citations92
US6925899B2Aug 9, 2005
Hollow steering rack bar and its manufacturing method
NETUREN CO LTD20 citations90
US4881722ANov 21, 1989
Apparatus for producing superfine particle
NETUREN CO LTD31 citations90
US10612642B2Apr 7, 2020
Method for manufacturing rack and hollow rack bar
NETUREN CO LTD8 citations84
US6328829B1Dec 11, 2001
Constrained hardening method and apparatus for deformed bar workpieces
NETUREN CO LTD18 citations82
US4705580ANov 10, 1987
Cutting method to be applied to producing helical springs by cold-forming thick high-strength wire
NETUREN CO LTD20 citations82
US9410320B2Aug 9, 2016
Reinforced concrete structure
NETUREN CO LTD8 citations80
US9328815B2May 3, 2016
Rack bar and rack bar teeth forming die
NETUREN CO LTD6 citations73
US9316294B2Apr 19, 2016
Rack bar and rack bar teeth forming die
NETUREN CO LTD3 citations73
US6156993ADec 5, 2000
Heat treatment method and apparatus using thermal plasma, and heat treated substance produced thereby
NETUREN CO LTD14 citations73
US11031881B2Jun 8, 2021
Output current synthesizer and power supply apparatus
NETUREN CO LTD2 citations72
US10973090B2Apr 6, 2021
Induction heating power supply apparatus
NETUREN CO LTD5 citations72
US10897795B2Jan 19, 2021
Induction heating power supply apparatus
NETUREN CO LTD2 citations72
US5492308AFeb 20, 1996
Constrained quenching apparatus and heat treatment apparatus
NETUREN CO LTD13 citations72
US4119764AOct 10, 1978
Helical reinforcing bar for steel cage in concrete structure
NETUREN CO LTD26 citations72
US10562138B2Feb 18, 2020
Method for manufacturing rack bar
NETUREN CO LTD6 citations71
US4987281AJan 22, 1991
Apparatus for continuous-direct-resistance heating of long-length particles
NETUREN CO LTD10 citations71
US4822969AApr 18, 1989
Apparatus for continuous-direct-resistance heating of long-length articles
NETUREN CO LTD12 citations71
US4407683AOct 4, 1983
Steel for cold plastic working
NETUREN CO LTD16 citations71
US4290841ASep 22, 1981
Apparatus for continuously forming a coating layer on unbonded PC steel bars
NETUREN CO LTD14 citations71
US4243447AJan 6, 1981
Method for continuously forming a coating layer on unbonded PC steel bars
NETUREN CO LTD13 citations71
US11291087B2Mar 29, 2022
Heating apparatus and heating method
NETUREN CO LTD2 citations70
US10356854B2Jul 16, 2019
Power conversion apparatus and power conversion method
NETUREN CO LTD2 citations70
US4171176AOct 16, 1979
Flexible bar reinforced concrete pile and method of construction
NETUREN CO LTD10 citations70
US12011775B2Jun 18, 2024
Steel joined body and method for manufacturing the same
NETUREN CO LTD2 citations69
US10443108B2Oct 15, 2019
Jig and heating apparatus with a jig
NETUREN CO LTD2 citations69
US10159117B2Dec 18, 2018
Induction heating system, induction heating method, output monitoring apparatus, output monitoring method, and induction heating apparatus
NETUREN CO LTD2 citations69
US9907118B2Feb 27, 2018
Current applying apparatus, current applying method and direct resistance heating apparatus
NETUREN CO LTD5 citations69
US7358467B2Apr 15, 2008
Electric power supply apparatus and induction heating apparatus
NETUREN CO LTD8 citations69
US6494073B2Dec 17, 2002
Method and apparatus for production of hollowed rack bars
NETUREN CO LTD13 citations69
US5488219AJan 30, 1996
Induction heating coil assembly and method for hardening inner surface of cylinder by using the same
NETUREN CO LTD7 citations69
US6024913AFeb 15, 2000
Precision quenching apparatus and method with induction heating
NETUREN CO LTD14 citations67
US4222799ASep 16, 1980
High-strength spring steel and its manufacturing process
NETUREN CO LTD11 citations67
US3979186ASep 7, 1976
Steel rod for prestressing concrete
NETUREN CO LTD14 citations66
US4538042AAug 27, 1985
Method and apparatus for forming reinforcing cage for prestressed concrete pile
NETUREN CO LTD12 citations65
US11247263B2Feb 15, 2022
Method for manufacturing rack bar
NETUREN CO LTD1 citations63
US4979089ADec 18, 1990
Method for balancing currents to switching devices
NETUREN CO LTD3 citations63
US4916598AApr 10, 1990
Apparatus for discerning faulty switching device
NETUREN CO LTD5 citations63
US11719758B2Aug 8, 2023
Load abnormality detecting circuit for inverter
NETUREN CO LTD0 citations62
US10449995B2Oct 22, 2019
Hollow rack bar and method of manufacturing the hollow rack bar
NETUREN CO LTD1 citations62
US5626693AMay 6, 1997
Method and apparatus for quenching a tubular workpiece
NETUREN CO LTD4 citations61
US11729868B2Aug 15, 2023
Induction heating device, induction heating equipment, induction heating method, and heat treatment method
NETUREN CO LTD0 citations60
USD954648SJun 14, 2022
Rectifier
NETUREN CO LTD0 citations60
USD954649SJun 14, 2022
Rectifier
NETUREN CO LTD0 citations60
USD953985SJun 7, 2022
Rectifier
NETUREN CO LTD0 citations60
USD953986SJun 7, 2022
Rectifier
NETUREN CO LTD0 citations60
US10966291B2Mar 30, 2021
Power conversion apparatus and power conversion method
NETUREN CO LTD0 citations60
US10952288B2Mar 16, 2021
Induction heating device, induction heating equipment, induction heating method, and heat treatment method
NETUREN CO LTD0 citations60
Showing the top 50 of 109 patents by PatentIndex Score.