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US4102803A
Expired / Lapsed
US
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Oxygen-consuming composition
Assignee: Mitsubishi Corp
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Filing: 1976-10-27
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Granted: 1978-07-25
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Expires: 1996-10-27
Abstract
Abstract An effective oxygen-consuming composition for packages, containers, or other closed spaces, especially containing an article susceptible to oxidative deterioration, comprises a dithionite for reacting with oxygen, sufficient alkaline material to at least partially neutralize sulfur dioxide released as a by-product of the oxygen consuming reaction, and porous filler particles in sufficient amount to promote contact with the ambient atmosphere, all in homogeneous mixture.
Inventors
- 👤 Daishiro Fujishima
- 👤 Shinichiro Fujishima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:10
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; A; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/708; A23B2/712; A23B2/717; A61; A61L; A61L9/00; A61L9/01; A62; A62B; A62B21/00; B01D53/14; B01D53/1493
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
52 words
An oxygen-consuming composition comprising a substantially dry homogeneous mixture of a particulate porous gas absorbing filler and an alkaline material having a dithionite uniformly dispersed therethrough, said alkaline material being present in a stoichiometric ratio of at least about 7.5:1 and being selected from the group consisting of alkaline hydroxides and carbonates.
Claim 2
Dependent Claim
52 words
An oxygen-consuming composition comprising a substantially dry homogeneous mixture of a particulate porous gas absorbing filler and an alkaline material having a dithionite uniformly dispersed therethrough, said alkaline material being present in a stoichiometric ratio of at least about 7.5:1 and being selected from the group consisting of alkaline hydroxides and carbonates.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein said ratio is at least 8:1.
Claim 4
Dependent Claim
24 words
The composition according to claim 1 wherein said dithionite is present in an amount of at least about 5% by weight of the composition.
Claim 5
Dependent Claim
12 words
The composition according to claim 1 wherein said dithionite is sodium dithionite.
Claim 6
Dependent Claim
18 words
The composition according to claim 1 wherein said particulate filler is about 0.1-4 mm in an average diameter.
Claim 7
Dependent Claim
14 words
The composition according to claim 1 wherein said alkaline material is an inorganic hydroxide.
Claim 8
Dependent Claim
28 words
The composition according to claim 1 wherein at least 20 parts by weight of said particulate filler is present per 100 parts by weight of said alkaline material.
Claim 9
Dependent Claim
15 words
The composition according to claim 1 including up to about 3% by weight of water.
Claim 10
Dependent Claim
40 words
A composition according to claim 1 wherein said filler is granular active carbon of 0.2-4 mm in average diameter, said alkaline material is selected from calcium hydroxide, magnesium hydroxide, sodium carbonate and sodium bicarbonate, and said dithionite is sodium dithionite.
Claim 11
Dependent Claim
36 words
A method for removing oxygen from the air in a closed space by introducing into such space a quantity of the composition according to claim 1 sufficient to consume said oxygen by reaction with said dithionite.
Claim 12
Dependent Claim
23 words
A method according to claim 10 wherein said closed space is a closed container or package enclosing an article susceptible to oxidative deterioration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |