US Patent No: RE37608

Number of patents in Portfolio can not be more than 2000

Plasma torch electronic pulsing circuit

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Importance

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Abstract

A plasma arc torch having new electronic circuit concepts wherein main current regulated power means regulates the pilot current prior to main arc transfer. Further, the circuit may contain two inductors to which DC current initially flows but is interrupted upon main arc transfer such that one inductor maintains the pilot arc while the current in the second inductor forces the establishment of the transferred arc. Also, advantages are presented in pulsing the cutting arc as well as pulsing the pilot arc.

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First Claim

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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
Solley, Dennis J Tucson, AZ 4 111
Tatham, David A Enfield, NH 7 67

Cited Art

Patent Info (Count) # Cites Year
 
POWCON INCORPORATED, A CORP. OF DE. (2)
4,839,499 System for supplying power to different cutting torches 15 1988
4,943,699 System for supplying power 19 1989
 
KABUSHIKI KAISHA KOMATSU SEISAKUSHO (1)
5,036,176 Plasma arc cutter and method of controlling the same 22 1989
 
L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE (1)
4,598,191 Very low power plasma arc cutting equipment 11 1985
 
LA SOUDURE AUTOGENE FRANCAISE (1)
4,280,042 Process and installation for automatic ignition of a plasma cutting torch 16 1980
 
THERMAL DYNAMICS CORPORATION (1)
4,324,971 Torch height acquisition using arc transfer 15 1980

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
ILLINOIS TOOL WORKS INC. (1)
7,022,935 Plasma-cutting torch with integrated high frequency starter 4 2003
 
THE ESAB GROUP, INC. (1)
7,034,245 Systems and methods for controlling pilot arc current in an arc cutting or welding machine 0 2004
 
THERMAL DYNAMICS CORPORATION (1)
6,794,601 Plasma arc torch system with pilot re-attach circuit and method 6 2002

Maintenance Fees

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11.5 Year Payment $7400.00 $3700.00 $1850.00 Sep 26, 2013
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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