US4487708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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
2026-10-28 06:16
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.
References Cited (Backward Citations)
US2580923A
Cited
US3551349A
Cited
US3552969A
Cited
US3764548A
Cited
US3843547A
Cited
US3983048A
Cited
US4019859A
Cited
US4192844A
Cited
US4172728A
Cited
US4282111A
Cited
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 |