Patent US4487708A successfully refreshed from Google Patents.
US4487708A
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Hydroquinone oxygen scavenger for use in aqueous mediums
Assignee: Veolia WTS USA Inc
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Filing: 1981-03-12
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Granted: 1984-12-11
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Expires: 2001-03-12
Abstract
Abstract An improved oxygen scavenger for aqueous mediums is disclosed which comprises hydrazine-free solution of hydroquinone and mu-amine.
Inventors
- 👤 John A. Muccitelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:46
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C02; C02F; C02F1/00; C02F1/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
41 words
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium which method comprises adding to the aqueous medium an effective amount for the purpose of a hydrazine-free treatment consisting essentially of a stable solution of hydroquinone and mu-amine.
Claim 2
Independent Claim
41 words
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium which method comprises adding to the aqueous medium an effective amount for the purpose of a hydrazine-free treatment consisting essentially of a stable solution of hydroquinone and mu-amine.
Claim 3
Dependent Claim
13 words
A method according to claim 1, wherein said solution is an aqueous solution.
Claim 4
Dependent Claim
28 words
A method according to claim 2, wherein said treatment is added in an amount of from about 0.01 to about 10,000 parts per million parts of aqueous medium.
Claim 5
Dependent Claim
18 words
A method according to claim 1, wherein the ratio of hydroquinone to mu-amine is about 1:1.3 or less.
Claim 6
Dependent Claim
36 words
A method according to claim 3, wherein, on a weight basis, the ratio of hydroquinone to mu-amine is about 7:1 or less and the total concentration of hydroquinone in said solution is about 45% or less.
Claim 7
Dependent Claim
18 words
A method according to claim 5, wherein said ratio of hydroquinone to mu-amine is about 7:1 to 1:99.
Claim 8
Dependent Claim
20 words
A method according to claim 6, wherein the total concentration of hydroquinone in said solution is about 7% to 45%.
Claim 9
Dependent Claim
20 words
A method according to claim 6 or 7, wherein said ratio of hydroquinone to mu-amine is about 5:1 to 1:10.
Claim 10
Dependent Claim
30 words
A method according to claim 3 or 6, wherein said treatment is added in an amount of from about 0.1 to about 100 parts per million parts of aqueous medium.
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |