US4698246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel laminates for paperboard cartons and a process of forming said laminates
Assignee: International Paper Co
•
Filing: 1986-03-05
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Granted: 1987-10-06
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Expires: 2006-03-05
Abstract
Abstract The present invention relates to 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. Also disclosed is a process of making the laminate. The laminate makes use of a layer of a heat-sealable glycol-modified polyethylene terephthalate to enhance the barrier properties of the laminate.
Inventors
- 👤 Charles E. Gibbons
- 👤 Allan A. Whillock
- 👤 Robert L. Lanham
- 👤 Joe L. Kinsey, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B65; B65D; B65D5/00; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B27/08; B32B27/16; B32B27/30; B32B27/304; B32B27/306; B32B27/32; B32B27/34; B32B27/36; B65D65/00; B65D65/38; B65D65/40; H; H04; H04N; H04N9/00; H04N9/44; H04N9/455; H04N9/64; H04N9/642; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2310/00; B32B2310/14; B32B2439/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
124 words
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising: (a) a paperboard substrate; (b) an outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner layer of a heat-sealable low density polyethylene polymer coated on said inner surface of said paperboard substrate; and (d) a liquid contact layer of a heat-sealable glycol modified polyethylene terephthalate which can heat-seal with the outside layer of low density polyethylene of the laminate on conventional equipment at temperatures ranging from 250° F.-500° F. extrusion coated on said outer surface of said inner layer of said polyethylene polymer, acting as a barrier to the transport of oxygen and essential oils/flavors therethrough.
Claim 2
Dependent Claim
124 words
A container for liquids containing essential oils and/or flavors, said container constructed from a laminate comprising: (a) a paperboard substrate; (b) an outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner layer of a heat-sealable low density polyethylene polymer coated on said inner surface of said paperboard substrate; and (d) a liquid contact layer of a heat-sealable glycol modified polyethylene terephthalate which can heat-seal with the outside layer of low density polyethylene of the laminate on conventional equipment at temperatures ranging from 250° F.-500° F. extrusion coated on said outer surface of said inner layer of said polyethylene polymer, acting as a barrier to the transport of oxygen and essential oils/flavors therethrough.
Claim 3
Dependent Claim
27 words
The container as claimed in claim 1 wherein said outer layer of a low density polyethylene polymer is corona discharge treated to enhance heat-sealability of said laminate.
Claim 4
Dependent Claim
26 words
The container as claimed in claim 1 wherein said outer layer of a low density polyethylene polymer is flame treated to enhance heat-sealability of said laminate.
Claim 5
Dependent Claim
33 words
The container as claimed in claim 2 wherein said surface of said inner layer of said heat-sealable low density polyethylene polymer is corona discharge treated to enhance adhesion of said heat-sealable PETG layer.
Claim 6
Dependent Claim
31 words
The container as claimed in claim 3 wherein said surface of said inner layer of said heat-sealable low-density polyethylene polymer is flame treated to enhance adhesion of said heat-sealable PETG layer.
Claim 7
Dependent Claim
36 words
The container as claimed in claim 1 wherein said laminate further comprises a layer of a heat-sealable glycol modified polyethylene terephthalate coated on said surface of said outer layer of said low density polyethylene polymer layer.
Claim 8
Dependent Claim
22 words
The container as claimed in claim 6 wherein said outer layer of low density polyethylene is corona discharge treated to enhance heat-sealability.
Claim 9
Dependent Claim
22 words
The container as claimed in claim 6 wherein said outer layer of a low density polyethylene is flame treated to enhance heat-sealability.
Claim 10
Dependent Claim
30 words
The container as claimed in claim 7 wherein said inner layer of a low density polyethylene is corona discharge treated to enhance adhesion to a subsequent coated heat-sealable PETG layer.
Claim 11
Dependent Claim
29 words
The container as claimed in claim 8 wherein said inner layer of a low density polyethylene is flame treated to enhance adhesion to a subsequent coated heat-sealable PETG layer.
Claim 12
Dependent Claim
97 words
A container for liquids containing essential oils and/or flavors constructed from a laminate comprising: (a) a paperboard substrate; (b) an outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner layer of heat-sealable low density polyethylene polymer coated on said inner surface of said paperboard substrate; (d) an oxygen barrier material layer coated on said outer surface of said inner layer of said polyethylene polymer; and (e) a heat-sealable layer of glycol modified polyethylene terephthalate coated on said outer surface of said oxygen barrier material layer.
Claim 13
Dependent Claim
97 words
A container for liquids containing essential oils and/or flavors constructed from a laminate comprising: (a) a paperboard substrate; (b) an outer layer of a heat-sealable low density polyethylene polymer coated on said outer surface of said paperboard substrate; (c) an inner layer of heat-sealable low density polyethylene polymer coated on said inner surface of said paperboard substrate; (d) an oxygen barrier material layer coated on said outer surface of said inner layer of said polyethylene polymer; and (e) a heat-sealable layer of glycol modified polyethylene terephthalate coated on said outer surface of said oxygen barrier material layer.
Claim 14
Dependent Claim
19 words
The container as claimed in claim 11 wherein said oxygen barrier material layer is a layer of aluminum foil.
Claim 15
Dependent Claim
19 words
The container as claimed in claim 11 wherein said oxygen barrier material layer is a layer of polyethylene terephthalate.
Claim 16
Dependent Claim
19 words
The container as claimed in claim 11 wherein said oxygen barrier material layer is a layer of polyvinylidene chloride.
Claim 17
Dependent Claim
18 words
The container as claimed in claim 11 wherein said oxygen barrier material layer is a layer of polyamide.
Claim 18
Dependent Claim
19 words
The container as claimed in claim 11 wherein said oxygen barrier material layer is a layer of polyethylene/vinyl alcohols.
Claim 19
Dependent Claim
27 words
The container as claimed in claim 11 wherein said outer layer of said low density polyethylene polymer is corona discharge treated to enhance heat-sealability of said laminate.
Claim 20
Dependent Claim
26 words
The container as claimed in claim 11 wherein said outer layer of said low density polyethylene polymer is flame treated to enhance heat-sealability of said laminate.
Claim 21
Dependent Claim
29 words
The container as claimed in claim 17 wherein said inner layer of said low-density polyethylene polymer is corona discharge treated to enhance adhesion of said subsequent heat-sealable PETG coating.
Claim 22
Dependent Claim
28 words
The container as claimed in claim 17 wherein said inner layer of said low-density polyethylene polymer is flame treated to enhance adhesion of said subsequent heat-sealable PETG coating.
Claim 23
Dependent Claim
109 words
A process for improving the resistance of paperboard to the migration of essential oils and/or flavorings, said process comprising the steps of: (a) extrusion coating an outer layer of a low density polyethylene polymer onto said outer surface of said paperboard; (b) corona discharge treating said outer layer of low density polyethylene polymer; (c) extrusion coating an inner layer of a low density polyethylene polymer onto said inner surface of said paperboard; (d) corona discharge treating said inner layer of low density polyethylene polymer; and (e) extrusion coating of a layer of a heat-sealable glycol-modified polyethylene terephthalate onto said surface of said inner layer of low density polyethylene polymer.
Claim 24
Dependent Claim
109 words
A process for improving the resistance of paperboard to the migration of essential oils and/or flavorings, said process comprising the steps of: (a) extrusion coating an outer layer of a low density polyethylene polymer onto said outer surface of said paperboard; (b) corona discharge treating said outer layer of low density polyethylene polymer; (c) extrusion coating an inner layer of a low density polyethylene polymer onto said inner surface of said paperboard; (d) corona discharge treating said inner layer of low density polyethylene polymer; and (e) extrusion coating of a layer of a heat-sealable glycol-modified polyethylene terephthalate onto said surface of said inner layer of low density polyethylene polymer.
Claim 25
Dependent Claim
105 words
A process for improving the resistance of paperboard to the migration of essential oils and/or flavorings, said process comprising the steps of: (a) extrusion coating an outer layer of a low density polyethylene polymer onto said outer surface of said paperboard; (b) flame treating said outer layer of low density polyethylene polymer; (c) extrusion coating an inner layer of a low density polyethylene polymer onto said inner surface of said paperboard; (d) flame treating said inner layer of low density polyethylene polymer; and (e) extrusion coating a layer of heat-sealable glycol-modified polyethylene terephthalate onto said surface of said inner layer of low density polyethylene polymer.
Claim 26
Dependent Claim
105 words
A process for improving the resistance of paperboard to the migration of essential oils and/or flavorings, said process comprising the steps of: (a) extrusion coating an outer layer of a low density polyethylene polymer onto said outer surface of said paperboard; (b) flame treating said outer layer of low density polyethylene polymer; (c) extrusion coating an inner layer of a low density polyethylene polymer onto said inner surface of said paperboard; (d) flame treating said inner layer of low density polyethylene polymer; and (e) extrusion coating a layer of heat-sealable glycol-modified polyethylene terephthalate onto said surface of said inner layer of low density polyethylene polymer.
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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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |