US4702966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen scavenger
Assignee: Pechiney Plastic Packaging Inc
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Filing: 1985-06-05
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Granted: 1987-10-27
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Expires: 2005-06-05
Abstract
Abstract This disclosure includes an activatable oxygen scavenger used as a part of a packaging structure for comestibles.
Inventors
- 👤 Christopher J. Farrell
- 👤 Boh C. Tsai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:27
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/24; B65D81/26; B65D81/266; B65D81/267; A; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/708; A23B2/712; A23B2/717; B32; B32B; B32B27/00; B32B27/06; B32B27/08; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
128 words
An article comprised of polymeric protective material having incorporated therein a dry oxygen scavenger material, the oxygen scavenger material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective material from outside the article, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective material is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at elevated temperatures to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 2
Dependent Claim
128 words
An article comprised of polymeric protective material having incorporated therein a dry oxygen scavenger material, the oxygen scavenger material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective material from outside the article, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective material is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at elevated temperatures to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 3
Dependent Claim
28 words
The article of claim 1 wherein said oxygen scavenger material is an alkali and a gelatin and said gelatin has been heat treated with or without said alkali.
Claim 4
Dependent Claim
27 words
The article of claim 2 wherein said heat treatment consists of raising the temperature of said gelatin to greater than 300° F. for more than 5 minutes.
Claim 5
Dependent Claim
29 words
The article of claim 2 wherein said heat treatment consists of raising the temperature of said oxygen scavenger material to greater than 300° F. for more than 5 minutes.
Claim 6
Dependent Claim
11 words
The article of claim 2 wherein said alkali is sodium hydroxide.
Claim 7
Dependent Claim
23 words
The article of claim 1 wherein the oxygen scavenger material is adapted to be triggered by water at an elevated temperature during retorting.
Claim 8
Dependent Claim
15 words
The article of claim 1 wherein the dry oxygen scavenger material is a singular material.
Claim 9
Dependent Claim
28 words
The article of claim 1 wherein the oxygen scavenger material is incapable of self-generating water and is triggerable without the action of any other material in the laminate.
Claim 10
Dependent Claim
14 words
The article of claim 1 wherein the oxygen scavenger material is a sulfite salt.
Claim 11
Dependent Claim
11 words
The article of claim 9 wherein said salt is potassium sulfite.
Claim 12
Dependent Claim
12 words
The article of claim 1 wherein said polymeric protective material is olefinic.
Claim 13
Dependent Claim
17 words
The article of claim 11 wherein said olefinic material is a melt blend of polyethylene and polypropylene.
Claim 14
Dependent Claim
15 words
The article of claim 12 wherein said polyethylene and polypropylene are in substantially equal proportions.
Claim 15
Dependent Claim
25 words
The article of claim 1 wherein the article is selected from the group consisting of a single layer structure, a chip, pellet, sheet, or film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |