US4282111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroquinone as an oxygen scavenger in an aqueous medium
Assignee: Veolia WTS USA Inc
•
Filing: 1980-04-28
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Granted: 1981-08-04
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Expires: 2000-04-28
Abstract
Abstract A method is disclosed for reducing the oxygen content of water using a hydrazine-free aqueous solution of hydroquinone.
Inventors
- 👤 Stanley J. Ciuba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:17
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/12; C23F11/122; C02; C02F; C02F1/00; C02F1/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
43 words
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium of a boiler condensate steam system comprising adding to said aqueous medium as the sole oxygen scavenger an effective amount for the purpose of a hydrazine-free aqueous solution of hydroquinone.
Claim 2
Independent Claim
43 words
A method for reducing the amount of oxygen in an oxygen-containing aqueous medium of a boiler condensate steam system comprising adding to said aqueous medium as the sole oxygen scavenger an effective amount for the purpose of a hydrazine-free aqueous solution of hydroquinone.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein said hydroquinone is added in an amount of about 0.05 to 200 parts per million parts of aqueous medium.
Claim 4
Dependent Claim
26 words
A method according to claim 2, wherein said hydroquinone is added in an amount of about 0.2 to 35 parts per million parts of aqueous medium.
Claim 5
Dependent Claim
14 words
A method according to claim 3, wherein said aqueous medium has an alkaline pH.
Claim 6
Dependent Claim
14 words
A method according to claim 1, wherein said aqueous medium has an alkaline pH.
Claim 7
Independent Claim
30 words
A method according to claims 1 or 4 wherein said hydroquinone is added in an excess amount which is effective to provide a residual amount thereof in the condensate system.
Claim 8
Independent Claim
37 words
A method for reducing the amount of oxygen in oxygen-containing feedwater to a boiler comprising adding to said feedwater as the sole oxygen scavenger an effective amount for the purpose of a hydrazine-free aqueous solution of hydroquinone.
Claim 9
Independent Claim
37 words
A method for reducing the amount of oxygen in oxygen-containing feedwater to a boiler comprising adding to said feedwater as the sole oxygen scavenger an effective amount for the purpose of a hydrazine-free aqueous solution of hydroquinone.
Claim 10
Dependent Claim
27 words
A method according to claim 7, wherein said hydroquinone is added in an excess amount which is effective to provide a residual amount thereof in the boiler.
Claim 11
Dependent Claim
25 words
A method according to claim 8, wherein said hydroquinone is added in an amount of about 0.05 to 200 parts per million parts of feedwater.
Claim 12
Dependent Claim
25 words
A method according to claim 9, wherein said hydroquinone is added in an amount of about 0.2 to 35 parts per million parts of feedwater.
Claim 13
Dependent Claim
15 words
A method according to claim 10, wherein said hydrazine-free aqueous solution also contains sodium hydroxide.
Claim 14
Dependent Claim
13 words
A method according to claim 7, wherein said feedwater has an alkaline pH.
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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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |