Patent US4389327A successfully refreshed from Google Patents.
US4389327A
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Use of selected 1,2-dihydro-1,2,4,5-tetrazines as oxygen-scavenging agents
Assignee: Olin Corp
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Filing: 1982-06-14
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Granted: 1983-06-21
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Expires: 2002-06-14
Abstract
Abstract Disclosed is a method for removing dissolved oxygen from a liquid (e.g., aqueous) system which comprises adding to said liquid system an effective amount of an oxygen-scavenging chemical selected from 1,2-dihydro-1,2,4,5-tetrazines of the formula <IMAGE> wherein R1 and R2 are individually selected from lower alkyl groups having 1 to 4 carbon atoms and phenyl.
Inventors
- 👤 Eugene F. Rothgery
- 👤 Robert N. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:09
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/30; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A method for removing dissolved oxygen in a liquid system, which comprises adding to said liquid system an effective amount of an oxygen-scavenging chemical selected from 1,2-dihydro-1,2,4,5-tetrazines of the formula ##STR7## wherein R 1 and R 2 are individually selected from the group consisting of lower alkyl groups having 1 to 4 carbon atoms and phenyl.
Claim 2
Independent Claim
56 words
A method for removing dissolved oxygen in a liquid system, which comprises adding to said liquid system an effective amount of an oxygen-scavenging chemical selected from 1,2-dihydro-1,2,4,5-tetrazines of the formula ##STR7## wherein R 1 and R 2 are individually selected from the group consisting of lower alkyl groups having 1 to 4 carbon atoms and phenyl.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein R 1 and R 2 are the same.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein R 1 and R 2 are both methyl.
Claim 5
Dependent Claim
14 words
The method of claim 2 wherein R 1 and R 2 are both ethyl.
Claim 6
Dependent Claim
14 words
The method of claim 2 wherein R 1 and R 2 are both phenyl.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein at least 20 moles of said oxygen-scavenging chemical are added for each mole of dissolved oxygen in said liquid system.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein said liquid system is an aqueous system.
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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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |