US4113652A
Expired / Lapsed
US
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Oxygen absorbent
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1976-12-17
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Granted: 1978-09-12
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Expires: 1996-12-17
Abstract
Abstract An oxygen absorbent comprising at least one alkaline earth metal sulfite, at least one ferrous compound and free water is disclosed.
Inventors
- 👤 Yoshio Yoshikawa
- 👤 Akira Amemiya
- 👤 Toshio Komatsu
- 👤 Yoshiaki Inoue
- 👤 Megumu Yuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:47
CPC Classifications
B; B65; B65B; B65B55/00; B65B55/02; B65B55/12; B65B55/19; B01; B01D; B01D53/00; B01D53/14; B01D53/1493
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
An oxygen absorbent consisting essentially of at least one alkaline earth metal sulfite, at least one ferrous salt and free water, the amount of the free water being from about 2 to about 200 parts by weight per 100 parts by weight of the combined weight of the sulfite and the ferrous compound, and the amount of the ferrous salt being from about 0.1 part to about 150 parts by weight of the sulfite.
Claim 2
Dependent Claim
74 words
An oxygen absorbent consisting essentially of at least one alkaline earth metal sulfite, at least one ferrous salt and free water, the amount of the free water being from about 2 to about 200 parts by weight per 100 parts by weight of the combined weight of the sulfite and the ferrous compound, and the amount of the ferrous salt being from about 0.1 part to about 150 parts by weight of the sulfite.
Claim 3
Dependent Claim
35 words
The oxygen absorbent as defined in claim 1 including at least one filler selected from the group consisting of gypsum, cellulose, diatomaceous earth, activated carbon, pearlite, zeolite, BaSO 4 , activated clay and silica gel.
Claim 4
Dependent Claim
16 words
An oxygen absorbent as defined in claim 1 wherein the alkaline earth metal sulfite is anhydrous.
Claim 5
Dependent Claim
16 words
An oxygen absorbent as defined in claim 1 wherein the alkaline earth metal sulfite is hydrous.
Claim 6
Dependent Claim
30 words
An oxygen absorbent as defined in claim 1 wherein the ferrous salt is ferrous sulfate, ferrous chloride, ferrous bromide, ferrous nitrate, ferrous phosphate, ferrous oxalate, ferrous formate or mixtures thereof.
Claim 7
Dependent Claim
21 words
An oxygen absorbent as defined in claim 1 wherein the ferrous salt is in the form of a metal chelate thereof.
Claim 8
Dependent Claim
44 words
An oxygen absorbent as defined in claim 1 containing from about 0.05 to about 1 equivalent of an alkaline material per equivalent of the ferrous salt, said alkaline material comprising a material which has a pH of more than 7 in admixture with water.
Claim 9
Dependent Claim
103 words
An oxygen absorbent consisting essentially of at least one alkaline earth metal sulfite, at least one ferrous salt, at least one ammonium salt, and free water, the amount of the free water being from about 2 to about 200 parts by weight per 100 parts by weight of the combined weight of the sulfite, the ferrous salt and the ammonium salt, the amount of the ferrous salt being from about 0.1 part to about 150 parts by weight of the sulfite, and the amount of the ammonium salt being at least 1 part by weight per 100 parts by weight of the sulfite.
Claim 10
Dependent Claim
103 words
An oxygen absorbent consisting essentially of at least one alkaline earth metal sulfite, at least one ferrous salt, at least one ammonium salt, and free water, the amount of the free water being from about 2 to about 200 parts by weight per 100 parts by weight of the combined weight of the sulfite, the ferrous salt and the ammonium salt, the amount of the ferrous salt being from about 0.1 part to about 150 parts by weight of the sulfite, and the amount of the ammonium salt being at least 1 part by weight per 100 parts by weight of the sulfite.
Claim 11
Dependent Claim
35 words
The oxygen absorbent as defined in claim 8 including at least one filler selected from the group consisting of gypsum, cellulose, diatomaceous earth, activated carbon, pearlite, zeolite, BaSO 4 , activated clay and silica gel.
Claim 12
Dependent Claim
20 words
An oxygen absorbent as defined in claim 8 wherein the ammonium salt is an ammonium salt of an inorganic acid.
Claim 13
Dependent Claim
20 words
An oxygen absorbent as defined in claim 8 wherein the ammonium salt is an ammonium salt of an organic acid.
References Cited (Backward Citations)
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Cited
US3366577A
Cited
US3625888A
Cited
US3862963A
Cited
US3960722A
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US3954652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |