US4948640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite polyethylene barrier structure
Assignee: International Paper Co
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Filing: 1988-08-31
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Granted: 1990-08-14
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Expires: 2008-08-31
Abstract
Abstract The present invention relates to an improved composite barrier laminate for an improved container for citrus juices and other liquids. The container utilizes a paperboard barrier laminate for the containment of essential oils and the prevention of losses of vitamin C. The laminate makes use of an inner barrier layer of a heat-sealable oxygen and flavor oil barrier material to enhance the barrier properties of the laminate as well as an extremely thin low density polyethylene food contact layer to provide a resultant secure homogenous non-polar heat seal.
Inventors
- 👤 Charles E. Gibbons
- 👤 Robert L. Lanham
- 👤 Joe L. Kinsey
- 👤 Allan A. Whillock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:09
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B27/30; B32B27/304; B32B27/32; B32B27/36; B32B7/00; B32B7/04; B32B7/12; B65; B65D; B65D5/00; B65D5/42; B65D5/56; B65D5/563; B32B2317/00; B32B2317/12; B32B2323/00; B32B2323/04; B32B2323/046; B32B2327/00; B32B2367/00; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/27; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31786; Y10T428/3179; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising: (a) a paperboard substrate; (b) a 0.18 mil outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner sandwich layer comprising a 4.5 lb. per 3000 square foot tie layer, a 0.000285 inch layer of aluminum foil and a 4.5 lb. per 3000 square foot tie layer applied on said inner surface of said paperboard substrate; and (d) a product-contact layer of a 0.5 mil heat-sealable low density polyethylene polymer extruded on said inner surface of said inner sandwich layer of tie layer-foil-tie layer whereby said laminate has been heat-sealed on conventional equipment at temperatures ranging from 250° F.-500° F., creating a non-polar homogeneous heat-seal.
Claim 2
Dependent Claim
132 words
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising: (a) a paperboard substrate; (b) a 0.18 mil outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner sandwich layer comprising a 4.5 lb. per 3000 square foot tie layer, a 0.000285 inch layer of aluminum foil and a 4.5 lb. per 3000 square foot tie layer applied on said inner surface of said paperboard substrate; and (d) a product-contact layer of a 0.5 mil heat-sealable low density polyethylene polymer extruded on said inner surface of said inner sandwich layer of tie layer-foil-tie layer whereby said laminate has been heat-sealed on conventional equipment at temperatures ranging from 250° F.-500° F., creating a non-polar homogeneous heat-seal.
Claim 3
Dependent Claim
116 words
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising: (a) a paperboard substrate; (b) a thin 0.8 mil thick outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner thin tie layer and a 0.000285 inches thick layer of an aluminum foil, applied together on said inner surface of said paperboard substrate; and (d) a thin 0.5 mil thick layer of a heat-sealable low density polyethylene polymer coated on said inner surface of said tie material-foil layer whereby said laminate has been heat-sealed on conventional equipment at temperatures ranging from 250° F.-500° F., creating a non-polar homogeneous heat-seal.
Claim 4
Dependent Claim
116 words
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising: (a) a paperboard substrate; (b) a thin 0.8 mil thick outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner thin tie layer and a 0.000285 inches thick layer of an aluminum foil, applied together on said inner surface of said paperboard substrate; and (d) a thin 0.5 mil thick layer of a heat-sealable low density polyethylene polymer coated on said inner surface of said tie material-foil layer whereby said laminate has been heat-sealed on conventional equipment at temperatures ranging from 250° F.-500° F., creating a non-polar homogeneous heat-seal.
Claim 5
Dependent Claim
105 words
A container for liquids containing essential oils and/or flavors constructed from a laminate comprising: (a) a paperboard substrate; (b) a thin 0.8 mil thick outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) a 0.000285 in thick layer of aluminum foil applied on the inner surface of said paperboard substrate; and (d) a thin 0.5 mil thick heat-sealable layer of a low density polyethylene polymer coated on said inner surface of said foil layer, wherein said laminate has been heat-sealed on conventional equipment at temperatures ranging from 250° F-500° F., creating a non-polar homogeneous heat-seal.
Claim 6
Dependent Claim
105 words
A container for liquids containing essential oils and/or flavors constructed from a laminate comprising: (a) a paperboard substrate; (b) a thin 0.8 mil thick outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) a 0.000285 in thick layer of aluminum foil applied on the inner surface of said paperboard substrate; and (d) a thin 0.5 mil thick heat-sealable layer of a low density polyethylene polymer coated on said inner surface of said foil layer, wherein said laminate has been heat-sealed on conventional equipment at temperatures ranging from 250° F-500° F., creating a non-polar homogeneous heat-seal.
Claim 7
Dependent Claim
115 words
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising: (a) a paperboard substrate; (b) a thin 0.8 mil thick outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner 0.2 to 0.7 mil thick oxygen and flavor oil barrier layer coated on said inner surface of said paperboard substrate; and (d) a thin 0.5 mil thick heat-sealable layer of a low density polyethylene polymers coated on said inner surface of said oxygen and flavor oil barrier layer whereby said laminate has been heat-sealed on conventional equipment ranging from 250° F.-500° F., creating a non-polar homogeneous heat seal.
Claim 8
Dependent Claim
115 words
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising: (a) a paperboard substrate; (b) a thin 0.8 mil thick outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner 0.2 to 0.7 mil thick oxygen and flavor oil barrier layer coated on said inner surface of said paperboard substrate; and (d) a thin 0.5 mil thick heat-sealable layer of a low density polyethylene polymers coated on said inner surface of said oxygen and flavor oil barrier layer whereby said laminate has been heat-sealed on conventional equipment ranging from 250° F.-500° F., creating a non-polar homogeneous heat seal.
Claim 9
Dependent Claim
20 words
The container as claimed in claim 4, wherein said oxygen and flavor oil barrier layer is a polyethylene terephthalate polymer.
Claim 10
Dependent Claim
20 words
The container as claimed in claim 4, wherein said oxygen and flavor oil barrier layer is a glycol-modified polyethylene terephthalate.
Claim 11
Dependent Claim
20 words
The container as claimed in claim 4, wherein said oxygen and flavor oil barrier layer is an acid-modified polyethylene terephthalate.
Claim 12
Dependent Claim
20 words
The container as claimed in claim 4, wherein said oxygen and flavor oil barrier layer is a polyvinylidene chloride copolymer.
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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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |