US Patent No: 5,091,108

Number of patents in Portfolio can not be more than 2000

Method of retarding corrosion of metal surfaces in contact with boiler water systems which corrosion is caused by dissolved oxygen

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Importance

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Abstract

New oxygen scavengers for boiler waters have been discovered, which oxygen scavengers are based upon N,N,N',N'-tetra substituted phenylenediamines. These compounds provide oxygen scavenging capabilities, metal passivating capabilities, volatility such that condensate systems in an operating boilder are protected, and may be formulated with other oxygen scavengers and other common treatment agents used in boiler waters. The preferred tetra substituted phenylenediamines are N,N,N', N'-tetramethyl-1,4-phenylenediamines, or its precursors.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
NALCO CHEMICAL COMPANYNAPERVILLE, IL539

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Harder, Scott R Naperville, IL 3 44
Pierce, Claudia C Naperville, IL 15 153
Soderquist, Cynthia A Bolingbrook, IL 7 102

Cited Art

Patent Info (Count) # Cites Year
 
BETZ LABORATORIES, INC. (7)
4,282,111 Hydroquinone as an oxygen scavenger in an aqueous medium 41 1980
4,279,767 Use of improved hydroquinone oxygen scavenger in aqueous mediums 24 1980
4,289,645 Hydroquinone and mu-amine compositions 43 1980
4,487,708 Hydroquinone oxygen scavenger for use in aqueous mediums 22 1981
4,549,968 Method of utilizing improved stability oxygen scavenger compositions 28 1984
4,569,783 Hydroquinone catalyzed oxygen scavenger and methods of use thereof 14 1984
4,541,932 Hydroquinone catalyzed oxygen scavenger and methods of use thereof 12 1984
 
NALCO CHEMICAL COMPANY (4)
4,269,717 Boiler additives for oxygen scavenging 40 1980
4,311,599 Reduced methylene blue for oxygen removal 5 1980
4,363,734 1,3-Dihydroxy acetone as an oxygen scavenger for water 13 1981
4,419,327 Method of scavenging dissolved oxygen in steam generating equipment using ammonia or amine neutralized erythorbic acid 11 1981
 
ONDEO NALCO COMPANY (2)
4,929,364 Amine/gallic acid blends as oxygen scavengers 10 1988
4,968,438 Gallic acid as an oxygen scavenger 12 1988
 
W.R. GRACE & CO.-CONN. (2)
4,278,635 Method for deoxygenation of water 47 1979
4,350,606 Composition and method for inhibiting corrosion 44 1980
 
GRACE DEARBORN INC. (1)
4,626,411 Composition and method for deoxygenation 40 1985
 
VEB LEUNA-WERKE WALTER ULBRICHT" 422 LEUNA 3, GERMANY (1)
4,540,494 Method for the removal of oxygen dissolved in water 8 1983

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
EKC TECHNOLOGY, INC. (6)
6,110,881 Cleaning solutions including nucleophilic amine compound having reduction and oxidation potentials 22 1996
6,319,885 Cleaning solutions including nucleophilic amine compound having reduction and oxidation potentials 9 2000
7,205,265 Cleaning compositions and methods of use thereof 2 2003
7,051,742 Cleaning solutions including nucleophilic amine compound having reduction and oxidation potentials 3 2004
7,144,849 Cleaning solutions including nucleophilic amine compound having reduction and oxidation potentials 3 2005
7,387,130 Cleaning solutions including nucleophilic amine compound having reduction and oxidation potentials 2 2006
 
APPLIED SPECIALTIES, INC. (2)
5,589,107 Method and composition for inhibiting corrosion 0 1994
5,714,118 Method and composition for inhibiting corrosion 2 1996
 
ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC (2)
7,204,937 Metal oxides dispersant composition 1 2003
7,857,989 Metal oxides dispersant composition 0 2007
 
AIR PRODUCTS AND CHEMICALS, INC. (1)
5,419,779 Stripping with aqueous composition containing hydroxylamine and an alkanolamine 65 1993
 
BETZ LABORATORIES, INC. (1)
5,556,451 Oxygen induced corrosion inhibitor compositions 9 1995
 
BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM (1)
6,984,734 Cyclo[n]pyrroles and methods thereto 8 2003
 
CATA CHEM INC. (1)
5,766,548 Method for minimizing solvent degradation and corrosion in amine solvent treatment systems 3 1997
 
ONDEO NALCO COMPANY (1)
5,282,379 Volatile tracers for diagnostic use in steam generating systems 11 1992
 
W.R. GRACE & CO.-CONN. (1)
5,176,849 Composition and method for scavenging oxygen 20 1992