US4192773A
Expired / Lapsed
US
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Oxygen absorbent
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1978-08-17
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Granted: 1980-03-11
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Expires: 1998-08-17
Abstract
Abstract An oxygen absorbent comprising (a) metal halide-coated metal powder having at least one metal halide coated on the surface of at least one metal powder, the amount of metal halide coated being in the range of from about 0.001 part to about 10 parts by weight per 100 parts by weight of the metal powder, and the water content of the metal halide-coated metal powder being less than 1% by weight on the basis of total weight of the metal halide-coated metal powder an (b) a water-containing material and a process for producing the same are disclosed.
Inventors
- 👤 Yoshio Yoshikawa
- 👤 Takanari Nawata
- 👤 Akira Amemiya
- 👤 Toshio Komatsu
- 👤 Yoshiaki Inoue
- 👤 Megumu Yuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:44
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; A; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/708; A23B2/712; A23B2/717
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
111 words
An oxygen absorbent comprising (a) metal halide-coated metal powder having at least one metal halide coated on the surface of at least one metal powder, the amount of metal halide coated being in the range of from about 0.001 part to about 10 parts by weight per 100 parts by weight of the metal powder, and the water content of the metal halide-coated metal powder being less than 1% by weight on the basis of total weight of the metal halide-coated metal powder, and (b) a water-containing particulate material having a water content of more than 1% by weight obtained by impregnating the particulate material with a water-containing humidity controlling agent.
Claim 2
Dependent Claim
111 words
An oxygen absorbent comprising (a) metal halide-coated metal powder having at least one metal halide coated on the surface of at least one metal powder, the amount of metal halide coated being in the range of from about 0.001 part to about 10 parts by weight per 100 parts by weight of the metal powder, and the water content of the metal halide-coated metal powder being less than 1% by weight on the basis of total weight of the metal halide-coated metal powder, and (b) a water-containing particulate material having a water content of more than 1% by weight obtained by impregnating the particulate material with a water-containing humidity controlling agent.
Claim 3
Dependent Claim
21 words
The oxygen absorbent as defined in claim 1 wherein the particulate material has particle size of 0.5 mm to 10 mm.
Claim 4
Dependent Claim
45 words
The oxygen absorbent as defined in claim 1 wherein the particulate material is selected from the group consisting of diatomaceous earth, perlite, zeolite, activated alumina, silicagel, activated carbon, activated clay, sand, pebble and mixtures thereof, and has particle size of 0.5 mm to 10 mm.
Claim 5
Dependent Claim
26 words
The oxygen absorbent as defined in claim 1 wherein the water-containing humidity controlling agent is an aqueous solution having an equilibrium humidity of more than 30%.
Claim 6
Dependent Claim
31 words
The oxygen absorbent as defined in claim 1 wherein the water-containing humidity controlling agent is an aqueous solution of a hydrophilic organic compound having an equilibrium humidity of more than 30%.
Claim 7
Dependent Claim
32 words
The oxygen absorbent as defined in claim 5 wherein the hydrophilic organic compound is selected from the group consisting of glycerin, ethylene glycol, sodium acetate, magnesium acetate, oxalic acid and mixtures thereof.
Claim 8
Dependent Claim
30 words
The oxygen absorbent as defined in claim 1 wherein the water-containing humidity controlling agent is an aqueous solution of an inorganic compound having an equilibrium humidity of more than 30%.
Claim 9
Dependent Claim
21 words
The oxygen absorbent as defined in claim 7 wherein the inorganic compound is an alkali metal or alkaline earth metal halide.
Claim 10
Dependent Claim
24 words
The oxygen absorbent as defined in claim 7 wherein the inorganic compound is selected from the group consisting of NaCl and MgCl 2 .
Claim 11
Dependent Claim
24 words
The oxygen absorbent as defined in claim 1 wherein the water-containing controlling agent is a saturated aqueous solution of NaCl or MgCl 2 .
Claim 12
Dependent Claim
34 words
The oxygen absorbent as defined in claim 1 wherein the water-containing particulate material is one obtained by impregnating the particulate material with water, followed by coating a finely divided filler on the particulate material.
Claim 13
Dependent Claim
41 words
The oxygen absorbent as defined in claim 11 wherein the finely divided filler is selected from the group consisting of gypsum, baked gypsum, activated carbon, calcium carbonate, magnesium hydroxide and mixtures thereof and has particle size of less than 100 mesh.
Claim 14
Dependent Claim
143 words
A process for producing an oxygen absorbent which comprises packing (a) metal halide-coated metal powder having at least one metal halide coated on the surface of at least one metal powder, the amount of metal halide coated being in the range of from about 0.001 part to about 10 parts by weight per 100 parts by weight of the metal powder, and the water content of the metal halide-coated metal powder being less than 1% by weight on the basis of total weight of the metal halide-coated metal powder, and (b) a water-containing material in an air-permeable bag so that the metal halide-coated metal powder does not contact the water-containing material before packing them, said water-containing material being water-containing particulate material having a water content of more than 1% by weight obtained by impregnating the particulate material with a water-containing humidity controlling agent.
Claim 15
Dependent Claim
143 words
A process for producing an oxygen absorbent which comprises packing (a) metal halide-coated metal powder having at least one metal halide coated on the surface of at least one metal powder, the amount of metal halide coated being in the range of from about 0.001 part to about 10 parts by weight per 100 parts by weight of the metal powder, and the water content of the metal halide-coated metal powder being less than 1% by weight on the basis of total weight of the metal halide-coated metal powder, and (b) a water-containing material in an air-permeable bag so that the metal halide-coated metal powder does not contact the water-containing material before packing them, said water-containing material being water-containing particulate material having a water content of more than 1% by weight obtained by impregnating the particulate material with a water-containing humidity controlling agent.
Claim 16
Dependent Claim
20 words
The process as defined in claim 13 wherein the particulate material has particle size of 0.5 mm to 10 mm.
Claim 17
Dependent Claim
44 words
The process as defined in claim 13 wherein the particulate material is selected from the group consisting of diatomaceous earth, perlite, zeolite, activated alumina, silicagel, activated carbon, activated clay, sand, pebble and mixtures thereof, and has particle size of 0.5 mm to 10 mm.
Claim 18
Dependent Claim
25 words
The process as defined in claim 13 wherein the water-containing humidity controlling agent is an aqueous solution having an equilibrium humidity of more than 30%.
Claim 19
Dependent Claim
30 words
The process as defined in claim 13 wherein the water-containing humidity controlling agent is an aqueous solution of a hydrophilic organic compound having an equilibrium humidity of more than 30%.
Claim 20
Dependent Claim
31 words
The process as defined in claim 17 wherein the hydrophilic organic compound is selected from the group consisting of glycerin, ethylene glycol, sodium acetate, magnesium acetate, oxalic acid and mixtures thereof.
Claim 21
Dependent Claim
29 words
The process as defined in claim 13 wherein the water-containing humidity controlling agent is an aqueous solution of an inorganic compound having an equilibrium humidity of more than 30%.
Claim 22
Dependent Claim
20 words
The process as defined in claim 19 wherein the inorganic compound is an alkali metal or alkali earth metal halide.
Claim 23
Dependent Claim
23 words
The process as defined in claim 19 wherein the inorganic compound is selected from the group consisting of NaCl and MgCl 2 .
Claim 24
Dependent Claim
23 words
The process as defined in claim 13 wherein the water-containing controlling agent is a saturated aqueous solution of NaCl or MgCl 2 .
Claim 25
Dependent Claim
33 words
The process as defined in claim 13 wherein the water-containing particulate material is one obtained by impregnating the particulate material with water, followed by coating a finely divided filler on the particulate material.
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) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |