Patent US4479917A successfully refreshed from Google Patents.
US4479917A
Expired / Lapsed
US
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Use of aminoguanidine compounds as oxygen-scavenging and corrosion-inhibiting agents
Assignee: Olin Corp
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Filing: 1983-11-14
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Granted: 1984-10-30
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Expires: 2003-11-14
Abstract
Abstract An oxygen-scavenging and corrosion-inhibiting agent for fluidic systems comprising an aminoguanidine compound selected from the formula: <IMAGE> or a salt thereof, wherein R is selected from H or a lower alkyl group having 1 to 4 carbon atoms; wherein X is selected from NH or NNH2; and Y is selected from -NH2 or -NHNH2.
Inventors
- 👤 Eugene F. Rothgery
- 👤 Steven A. Manke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:07
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/148; C02; C02F; C02F1/00; C02F1/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
A method for scavenging oxygen and for protecting metal surfaces against corrosion caused by contact of an oxygen-containing fluid therewith comprising adding an effective amount of an aminoguanidine compound to scavenge at least a portion of the oxygen contained therein and to inhibit corrosion on the metal surfaces in contact therewith; said aminoguanidine compound selected from the formula ##STR14## or a salt thereof; wherein R is selected from H or a lower alkyl group having 1 to 4 carbon atoms; wherein X is selected from NH or NNH 2 ; and Y is selected from --NH 2 or --NHNH 2 .
Claim 2
Independent Claim
101 words
A method for scavenging oxygen and for protecting metal surfaces against corrosion caused by contact of an oxygen-containing fluid therewith comprising adding an effective amount of an aminoguanidine compound to scavenge at least a portion of the oxygen contained therein and to inhibit corrosion on the metal surfaces in contact therewith; said aminoguanidine compound selected from the formula ##STR14## or a salt thereof; wherein R is selected from H or a lower alkyl group having 1 to 4 carbon atoms; wherein X is selected from NH or NNH 2 ; and Y is selected from --NH 2 or --NHNH 2 .
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said fluidic system is an aqueous one.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein said aqueous system is a boiler water system.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein the amount of said aminoguanidine added to said fluidic system is from about 0.01 to about 1000 parts by weight of said aminoguanidine compound per million parts of fluid.
Claim 6
Dependent Claim
9 words
The method of claim 1 wherein R is hydrogen.
Claim 7
Dependent Claim
14 words
The method of claim 5 wherein said aminoguanidine compound is a salt of monoaminoguanidine.
Claim 8
Dependent Claim
13 words
The method of claim 6 wherein said salt of monoaminoguanidine is monoaminoguanidine phosphate.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein a catalytic amount of a quinone compound is added with said aminoguanidine compound.
Claim 10
Dependent Claim
11 words
The method of claim 8 wherein said quinone compound is methylhydroquinone.
Claim 11
Dependent Claim
62 words
The method of claim 8 wherein an organometallic complex is further added with said aminoguanidine compound, said organometallic complex being the reaction product of (i) a hydroxide selected from the group consisting of cobaltous hydroxide and manganous hydroxide; and (ii) at least one organic ligand selected from the group consisting of unsubstituted and substituted amino derivatives of carboxylic acids and salts thereof.
Claim 12
Dependent Claim
17 words
The method of claim 10 wherein said organic ligand is ethylenediamine tetraacetic acid (EDTA) and its salts.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |