US4166807A
Expired / Lapsed
US
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Oxygen absorbent
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1977-11-28
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Granted: 1979-09-04
•
Expires: 1997-11-28
Abstract
Abstract An oxygen absorbent comprising iron and a metal halide, characterized in that the iron contains sulfur in an amount of from 0.05% to 5% on the basis of the weight of the iron is disclosed.
Inventors
- 👤 Toshio Komatsu
- 👤 Yoshiaki Inoue
- 👤 Megumu Yuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:48
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/708; A23B2/712; A23B2/717; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
46 words
An oxygen absorbent comprising iron containing sulfur in an amount of from 0.05 to 5% based on the weight of iron, and at least one metal halide, in an amount of from 0.001 to 300 parts by weight per 100 parts by weight of the iron.
Claim 2
Dependent Claim
46 words
An oxygen absorbent comprising iron containing sulfur in an amount of from 0.05 to 5% based on the weight of iron, and at least one metal halide, in an amount of from 0.001 to 300 parts by weight per 100 parts by weight of the iron.
Claim 3
Dependent Claim
28 words
The oxygen absorbent as defined in claim 1 wherein the iron contains 0.1 to 1% by weight of sulfur on the basis on the weight of the iron.
Claim 4
Dependent Claim
21 words
The oxygen absorbent as defined in claim 1 wherein the iron is in the form of powder, foil, fiber or chips.
Claim 5
Dependent Claim
17 words
The oxygen absorbent as defined in claim 1 wherein the iron is in the form of powder.
Claim 6
Dependent Claim
21 words
The oxygen absorbent as defined in claim 1 wherein the absorbent is prepared by mixing the iron with solid metal halide.
Claim 7
Dependent Claim
35 words
The oxygen absorbent as defined in claim 5 wherein the amount of the solid metal halide is in the range of from 0.1 to 300 parts by weight per 100 parts by weight of iron.
Claim 8
Dependent Claim
34 words
The oxygen absorbent as defined in claim 5 wherein the amount of the metal halide is in the range of from 1 to 100 parts by weight per 100 parts by weight of iron.
Claim 9
Dependent Claim
25 words
The oxygen absorbent as defined in claim 1 wherein the absorbent is prepared by mixing the iron with an aqueous solution of the metal halide.
Claim 10
Dependent Claim
34 words
The oxygen absorbent as defined in claim 8 wherein the amount of the metal halide is in the range of from 0.001 to 10 parts by weight per 100 parts by weight of iron.
Claim 11
Dependent Claim
34 words
The oxygen absorbent as defined in claim 8 wherein the amount of the metal halide is in the range of from 0.01 to 5 parts by weight per 100 parts by weight of iron.
Claim 12
Dependent Claim
16 words
The oxygen absorbent as defined in claim 1 wherein the absorbent is substantially free from water.
Claim 13
Dependent Claim
14 words
The oxygen absorbent as defined in claim 1 wherein the absorbent further contains water.
Claim 14
Dependent Claim
27 words
The oxygen absorbent as defined in claim 12 wherein the amount of water is more than 1 part by weight per 100 parts by weight of iron.
Claim 15
Dependent Claim
27 words
The oxygen absorbent as defined in claim 12 wherein the amount of water is more than 5 parts by weight per 100 parts by weight of iron.
Claim 16
Dependent Claim
21 words
The oxygen absorbent as defined in claim 1 wherein the absorbent further contains at least one compound having water of hydration.
Claim 17
Dependent Claim
46 words
The oxygen absorbent as defined in claim 15 wherein the compound having water of hydration is selected from the group consisting of Na 2 SO 4 .10H 2 O, Na 2 SO 3 .7H 2 O, Na 2 CO 3 .10H 2 O and mixtures thereof.
Claim 18
Dependent Claim
32 words
The oxygen absorbent as defined in claim 15 wherein the amount of the compound having water of hydration is more than 2 parts by weight per 100 parts by weight of iron.
Claim 19
Dependent Claim
32 words
The oxygen absorbent as defined in claim 15 wherein the amount of the compound having water of hydration is more than 10 parts by weight per 100 parts by weight of iron.
Claim 20
Dependent Claim
23 words
The oxygen absorbent as defined in claim 1 wherein the absorbent further contains at least one filler which has low solubility in water.
Claim 21
Dependent Claim
63 words
The oxygen absorbent as defined in claim 19 wherein the filler is selected from the group consisting of active carbon, active alumina, active clay, diatomaceous earth, perlite, cellulose, zeolite, finely divided silica gel, alkali earth metal sulfates, kaolin, silicon nitride, colloidal silica, talc, bentonite, silica aluminagel, anhydrous silica, calcium silicate, gypsum, asbestos, magnesium oxide, natural graphite, aluminum hydroxide, iron oxides and mixtures thereof.
Claim 22
Dependent Claim
17 words
The oxygen absorbent as defined in claim 1 wherein the absorbent further contains at least one binder.
Claim 23
Dependent Claim
43 words
The oxygen absorbent as defined in claim 21 wherein the binder is selected from the group consisting of sodium alginate, carboxymethyl cellulose (CMC), hydroxymethyl cellulose, methyl cellulose, ethyl cellulose, propyl cellulose, sodium carboxymethyl cellulose, starch, polyvinyl alcohol (PVA), tragacanth gum and mixture thereof.
Claim 24
Dependent Claim
33 words
The oxygen absorbent as defined in claim 21 wherein the amount of the binder is in the range of from 0.01 to 50 parts by weight per 100 parts by weight of iron.
Claim 25
Dependent Claim
18 words
The oxygen absorbent as defined in claim 1 wherein the absorbent further contains at least one polyvalent alcohol.
Claim 26
Dependent Claim
34 words
The oxygen absorbent as defined in claim 24 wherein the polyvalent alcohol is selected from the group consisting of pentaerythritol, trimethylol propane, trimethylol ethane, glycerine, ethylene glycol, glucose, saccharose mannitol, fructose and mixtures thereof.
Claim 27
Dependent Claim
34 words
The oxygen absorbent as defined in claim 24 wherein the amount of the polyvalent alcohol is in the range of from 0.01 to 50 parts by weight per 100 parts by weight of iron.
Claim 28
Dependent Claim
18 words
The oxygen absorbent as defined in claim 1 wherein the absorbent further contains at least one alkaline material.
Claim 29
Dependent Claim
49 words
The oxygen absorbent as defined in claim 27 wherein the alkaline material is selected from the group consisting of hydroxides, carbonates, sulfites, thiosulfates, phosphates, hydrogenphosphates and organic salts of alkali metals and hydroxides, carbonates, sulfites, thiosulfates, phosphates, hydrogenphosphates and organic acid salts of alkali earth metals and mixtures thereof.
Claim 30
Dependent Claim
34 words
The oxygen absorbent as defined in claim 27 wherein the amount of the alkaline material is in the range of from 0.1 to 20 parts by weight per 100 parts by weight of iron.
Claim 31
Dependent Claim
46 words
The oxygen absorbent as defined in claim 1, wherein said at least one metal halide is selected from the group consisting of alkali metal halides, alkali earth metal halides, copper halides, zinc halides, aluminum halides, tin halides, manganese halides, iron halides, cobalt halides and nickel halides.
Claim 32
Dependent Claim
26 words
The oxygen absorbent as defined in claim 30, wherein said metal halide is selected from the group consisting of metal chlorides, metal bromides and metal iodides.
Claim 33
Dependent Claim
25 words
The oxygen absorbent as defined in claim 30, wherein said metal halide is a halide selected from the group consisting of lithium, sodium and potassium.
Claim 34
Dependent Claim
25 words
The oxygen absorbent as defined in claim 31, wherein said metal halide is a halide selected from the group consisting of lithium, sodium and potassium.
Claim 35
Dependent Claim
25 words
The oxygen absorbent as defined in claim 30, wherein said metal halide is a halide selected from the group consisting of calcium, magnesium and barium.
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) | 1982-09-03 | 1983-03-05 | 1983-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-03 | 1987-03-05 | 1987-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-03 | 1991-03-05 | 1991-09-04 | $7700.00 | Window Closed / Lapsed |