US Patent No: 6,337,460

Number of patents in Portfolio can not be more than 2000

Plasma arc torch and method for cutting a workpiece

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ALSO PUBLISHED AS: 20010025833
ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

A plasma arc torch and method for cutting a workpiece in which the torch has a primary gas flow path for receiving a primary working gas and directing it through the torch to a central exit opening of the torch for exhaustion from the torch onto the workpiece in the form of an ionized plasma. A secondary gas flow path in the torch receives a secondary gas separate from the primary working gas and directs it through the torch. The primary gas flow path is in fluid communication with the secondary gas flow path substantially upstream of the central exit opening of the torch to bleed primary working gas in the primary gas flow path into the secondary gas flow path for admixture therewith to form a secondary gas mixture to be exhausted from the torch.

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First Claim

Related Publications

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Patent Owner(s)

Patent OwnerAddressTotal Patents
DEUTSCHE BANK TRUST COMPANY AMERICAS CORPORATE TRUST & AGENCY SERVICESWEST LEBANON, NH24

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Horner-Richardson, Kevin D Cornish, NH 29 100
Kelkar, Milind G Pune, IN 3 15
Putnam, Geoffrey H Topsham, VT 6 4
Roberts, Jesse A Milton, VT 13 38
Small, David A Sharon, VT 9 82

Cited Art

Patent Info (Count) # Cites Year
 
HYPERTHERM, INC. (8)
4,861,962 Nozzle shield for a plasma arc torch 41 1988
4,902,871 Apparatus and process for cooling a plasma arc electrode 61 1988
5,120,930 Plasma arc torch with improved nozzle shield and step flow 16 1989
5,132,512 Arc torch nozzle shield for plasma 38 1991
5,396,043 Plasma arc cutting process and apparatus using an oxygen-rich gas shield 33 1991
5,317,126 Nozzle and method of operation for a plasma arc torch 28 1992
5,591,357 Plasma arc cutting process and apparatus using an oxygen-rich gas shield 26 1995
5,695,662 Plasma arc cutting process and apparatus using an oxygen-rich gas shield 33 1996
 
ESAB WELDING PRODUCTS, INC. (4)
5,023,425 Electrode for plasma arc torch and method of fabricating same 52 1990
5,013,885 Plasma arc torch having extended nozzle of substantially hourglass 27 1990
5,017,752 Plasma arc torch starting process having separated generated flows of non-oxidizing and oxidizing gas 33 1990
5,216,221 Plasma arc torch power disabling mechanism 17 1992
 
DEUTSCHE BANK TRUST COMPANY AMERICAS CORPORATE TRUST & AGENCY SERVICES (2)
4,748,312 Plasma-arc torch with gas cooled blow-out electrode 29 1986
4,954,683 Plasma arc gouger 16 1989
 
LINCOLN GLOBAL, INC. (2)
5,105,061 Vented electrode for a plasma torch 21 1991
5,726,415 Gas cooled plasma torch 23 1996
 
BROTHER KOGYO KABUSHIKI KAISHA (1)
5,235,155 Plasma cutting device 16 1990
 
CAPITAL FORMATION, INC., A CORPORATION OF DE (1)
4,973,816 Plasma torch with safety switch 24 1989
 
KABUSHIKI KAISHA KOMATSU SEISAKUSHO (1)
5,393,952 Plasma torch for cutting use with nozzle protection cap having annular secondary GPS passage and insulator disposed in the secondary gas passage 23 1993
 
KOMATSU LTD. (1)
5,900,168 Plasma cutting method 5 1997
 
L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE (1)
4,625,094 Plasma torches 28 1983
 
LINCOLN ELECTRIC COMPANY, THE (1)
5,247,152 Plasma torch with improved cooling 21 1991
 
LINCOLN ELECTRIC HOLDINGS, INC. (1)
5,208,441 Plasma arc ignition system 15 1992
 
N P K ZA KONTROLNO ZAVARACHNI RABOTI (1)
4,743,734 Nozzle for plasma arc torch 29 1985
 
SAIPEM AMERICA INC. (1)
2005/0155,814 Method and apparatus for installing a sensor array 2004
 
THE ESAB GROUP, INC. (1)
5,681,489 Plasma arc torch including means for disabling power source 13 1995
 
TWECO PRODUCTS, INC. (1)
4,967,055 Plasma torch 23 1989
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
5,278,388 Plasma welding and cutting gun for discharging plasma gas with constant outlet pressure 7 1993

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
HYPERTHERM, INC. (1)
8,338,740 Nozzle with exposed vent passage 0 2008
 
THE ESAB GROUP, INC. (1)
8,258,423 Retract start plasma torch with reversible coolant flow 0 2009
 
THERMACUT S.R.O. (1)
6,963,045 Plasma arc cutting torch nozzle 3 2003
 
THERMAL DYNAMICS CORPORATION (1)
D519135 Tip for a plasma arc torch 1 2004

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
11.5 Year Payment $7400.00 $3700.00 $1850.00 Jul 8, 2013
Fee Large entity fee small entity fee micro entity fee
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00