Patent GB355705A successfully refreshed from Google Patents.
US4104192A
Expired / Lapsed
US
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Oxygen absorbent
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1977-01-19
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Granted: 1978-08-01
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Expires: 1997-01-19
Abstract
Abstract An oxygen absorbent comprising a dithionite and at least one compound having water of crystallization or water of hydration is disclosed.
Inventors
- 👤 Yoshio Yoshikawa
- 👤 Akira Amemiya
- 👤 Sigeru Kimoto
- 👤 Hidenori Kimpara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/70; A23B2/725; A23B2/788; C; C09; C09K; C09K15/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
15 words
An oxygen absorbent comprising a dithionite and at least one compound having water of hydration.
Claim 2
Dependent Claim
15 words
An oxygen absorbent comprising a dithionite and at least one compound having water of hydration.
Claim 3
Dependent Claim
22 words
The absorbent as defined in claim 1 wherein the dithionite is selected from the group consisting of sodium dithionite and zinc dithionite.
Claim 4
Dependent Claim
40 words
The absorbent as defined in claim 1 wherein the compound having water of crystallization in the range of from about 0.2 parts by weight to about 2000 parts by weight is used per 100 parts by weight of the dithionite.
Claim 5
Dependent Claim
21 words
An oxygen absorbent comprising a dithionite, at least one compound having water of hydration and at least one anhydrous alkaline material.
Claim 6
Dependent Claim
21 words
An oxygen absorbent comprising a dithionite, at least one compound having water of hydration and at least one anhydrous alkaline material.
Claim 7
Dependent Claim
22 words
The absorbent as defined in claim 4 wherein the dithionite is selected from the group consisting of sodium dithionite and zinc dithionite.
Claim 8
Dependent Claim
40 words
The absorbent as defined in claim 4 wherein the compound having water of crystallization in the range of from about 0.2 parts by weight to about 2000 parts by weight is used per 100 parts by weight of the dithionite.
Claim 9
Dependent Claim
19 words
An oxygen absorbent comprising a dithionite, at least one compound having water of hydration and at least one absorbent.
Claim 10
Dependent Claim
19 words
An oxygen absorbent comprising a dithionite, at least one compound having water of hydration and at least one absorbent.
Claim 11
Dependent Claim
22 words
The absorbent as defined in claim 7 wherein the dithionite is selected from the group consisting of sodium dithionite and zinc dithionite.
Claim 12
Dependent Claim
40 words
The absorbent as defined in claim 7 wherein the compound having water of crystallization in the range of from about 0.2 parts by weight to about 2000 parts by weight is used per 100 parts by weight of the dithionite.
Claim 13
Dependent Claim
25 words
An oxygen absorbent comprising a dithionite, at least one compound having water of hydration, at least one anhydrous alkaline material and at least one absorbent.
Claim 14
Dependent Claim
25 words
An oxygen absorbent comprising a dithionite, at least one compound having water of hydration, at least one anhydrous alkaline material and at least one absorbent.
Claim 15
Dependent Claim
22 words
The absorbent as defined in claim 10 wherein the dithionite is selected from the group consisting of sodium dithionite and zinc dithionite.
Claim 16
Dependent Claim
40 words
The absorbent as defined in claim 10 wherein the compound having water of crystallization in the range of from about 0.2 parts by weight to about 2000 parts by weight is used per 100 parts by weight of the dithionite.
References Cited (Backward Citations)
US2825651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |