US3952940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paperboard cartons with liquid-proof liners
Assignee: Flag Carton Corp Ltd
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Filing: 1975-02-24
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Granted: 1976-04-27
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Expires: 1995-02-24
Abstract
Abstract A container for liquids such as milk comprises an outer paperboard carton and an inner tubular liner of flexible plastic film adhered to the carton, the liner being adhered to the walls of the carton adjacent diagonally opposite corners of one end of the carton. The sidewalls of the carton adjacent one of these corners are formed with a line of weakness, the liner being adhered to the carton on either side of this line so that the corner may be lifted from the remainder of the carton to split both the carton and the liner and allow the contents of the container to be discharged from a pouring lip thus formed at the corner of the container.
Inventors
- 👤 James A. Malcolm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:34
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/42; B65D5/44; B65D5/46; B65D5/46072; B65D5/4608; B65D5/70; B65D5/701; B65D5/703
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
250 words
A knocked down container that can be erected into a rectangular box that has a liner and is suitable for holding and dispensing fluid material, comprising a paperboard blank having four rectangular side forming panels, flaps protruding beyond the ends of the panels for closing the ends of the box, a flexible tubular liner arranged flat on the inner surfaces of a pair of adjoining panels and coterminous with the total width of said pair of panels, the liner protruding longitudinally beyond the ends of said pair of panels, a seal closing one end of the liner, the other end of the liner being unsealed, said seal extending widthwise of the liner whereby when the box is erected, said seal extends adjacent one diagonal of one end of the box, areas on the blank being adhesively attached to the liner at locations adjacent the ends of the other diagonal of said box end, the adhesive at said locations being longitudinally spaced from said seal by a distance half the length of said other diagonal whereby when the box is erected the liner will be taut adjacent said other diagonal, and wherein the blank is weakened along a line extending into two adjacent side forming panels and across one of said areas, providing when the box is erected a corner of the box adhered to the liner which corner can be lifted to tear the box and liner simultaneously along the weakened line and leave a pouring lip on the container.
Claim 2
Dependent Claim
250 words
A knocked down container that can be erected into a rectangular box that has a liner and is suitable for holding and dispensing fluid material, comprising a paperboard blank having four rectangular side forming panels, flaps protruding beyond the ends of the panels for closing the ends of the box, a flexible tubular liner arranged flat on the inner surfaces of a pair of adjoining panels and coterminous with the total width of said pair of panels, the liner protruding longitudinally beyond the ends of said pair of panels, a seal closing one end of the liner, the other end of the liner being unsealed, said seal extending widthwise of the liner whereby when the box is erected, said seal extends adjacent one diagonal of one end of the box, areas on the blank being adhesively attached to the liner at locations adjacent the ends of the other diagonal of said box end, the adhesive at said locations being longitudinally spaced from said seal by a distance half the length of said other diagonal whereby when the box is erected the liner will be taut adjacent said other diagonal, and wherein the blank is weakened along a line extending into two adjacent side forming panels and across one of said areas, providing when the box is erected a corner of the box adhered to the liner which corner can be lifted to tear the box and liner simultaneously along the weakened line and leave a pouring lip on the container.
Claim 3
Dependent Claim
29 words
A container as claimed in claim 1 wherein the adhesive treated areas include a band of adhesive along the ends of said pair of panels closest to said seal.
Claim 4
Dependent Claim
115 words
A container as claimed in claim 1, wherein said pair of panels are the central panels of the blank, and the other two panels can be joined by a flap at the edge of one of them, wherein the adhesive treated areas comprise a first band of adhesive extending widthwise of said pair of central panels near one end thereof at said distance from said seal, and a second band of adhesive on the last mentioned flap, wherein a third band of adhesive extends widthwise of said pair of central panels near the opposite end thereof, and wherein the other end of the liner is open for filling the liner when the box is erected.
Claim 5
Dependent Claim
38 words
A container as claimed in claim 3 wherein the end flaps of the blank are adhesively secured to the liner adjacent its unsealed end to assist in manipulating the liner during setting up and closing of the container.
Claim 6
Dependent Claim
136 words
A container comprising an outer folded paperboard carton having flat rectangular ends, an inner flexible bag containing fluid material, the bag substantially filling the carton and being affixed thereto and supported thereby, wherein the bag is adhesively affixed to areas of the interior of the carton adjacent the ends of one diagonal of one end of the carton and is taut adjacent said diagonal, wherein two adjacent sidewalls of the carton have a line of weakness extending across one of said areas around a corner of the carton adjacent one end of said diagonal so that an area in which the bag is adhered to the carton extends across said line, whereby by lifting said corner of the carton the container can be opened along said line of weakness and the bag will simultaneously tear therealong.
Claim 7
Dependent Claim
136 words
A container comprising an outer folded paperboard carton having flat rectangular ends, an inner flexible bag containing fluid material, the bag substantially filling the carton and being affixed thereto and supported thereby, wherein the bag is adhesively affixed to areas of the interior of the carton adjacent the ends of one diagonal of one end of the carton and is taut adjacent said diagonal, wherein two adjacent sidewalls of the carton have a line of weakness extending across one of said areas around a corner of the carton adjacent one end of said diagonal so that an area in which the bag is adhered to the carton extends across said line, whereby by lifting said corner of the carton the container can be opened along said line of weakness and the bag will simultaneously tear therealong.
Claim 8
Dependent Claim
79 words
A container as claimed in claim 5, wherein said one end of the carton is formed by flaps extending from the sidewalls of the carton, portions of the flaps extending from said two adjacent sidewalls of the carton and adjacent said line of weakness also being provided with lines of weakness about which said portions may bend to provide a fulcrum for the lifting of said corner, and wherein the overlying portions of the remaining flaps are cut away.
Claim 9
Dependent Claim
36 words
A container according to claim 5 wherein the bag is a tubular bag closed by a seal that is transverse to the bag and extends along the other diagonal of said one end of the carton.
Claim 10
Dependent Claim
39 words
A container as claimed in claim 5, wherein the bag is fixed to the carton along a band of adhesive extending along the inner surface of said two adjacent sidewalls of the carton and surrounding said line of weakness.
Claim 11
Dependent Claim
67 words
A container as claimed in claim 8, wherein the bag is further affixed to the carton along a band of adhesive extending longitudinally of the carton from the other end of said first diagonal, the bands of adhesive being, at the ends of the first diagonal, spaced from said seal by a distance half the length of said first diagonal whereby tautness of the bag is achieved.
Claim 12
Dependent Claim
26 words
A container as claimed in claim 9, wherein the downwardly extending band of adhesive is provided on an inturned flap joining two sides of the carton.
Claim 13
Dependent Claim
41 words
A container as claimed in claim 9, wherein the bag is further affixed to the carton along a band of adhesive extending near the other end of the carton along the inner surfaces of said two adjacent sides of the carton.
Claim 14
Dependent Claim
56 words
A container as claimed in claim 5, wherein the carton has in adjacent sidewalls thereof a pair of side flaps that can be pressed inwardly to grasp the container, the side flaps being spaced from locations where the bag is affixed to the carton whereby the bag can flex when the side flaps are pressed inwardly.
Claim 15
Dependent Claim
32 words
A container as claimed in claim 12, wherein the adjacent sidewalls are joined by at least one glued flange projecting from one of the adjacent sidewalls and overlapping the other adjacent sidewall.
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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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |