Patent US3756495A successfully refreshed from Google Patents.
US3756495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boilable bakeable package
Assignee: Robalex Inc
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Filing: 1972-03-02
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Granted: 1973-09-04
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Expires: 1992-03-02
Abstract
Abstract A laminated or multi-wall carton or tray is provided which has a self-supporting outer layer or wall portion of paperboard which is a laminated structure, and includes a paperboard with a plastic or foil layer adhered or laminated thereto. The laminated layer of material may be on one or both sides of the paperboard adhered to the surface, preferably before the tray or carton is die cut and formed into a tray or carton. This laminated structure or paperboard outer wall of the carton or tray is an independent self-supporting unit during the manufacture of the laminated tray or carton though it is not sufficiently strong to form a carton or tray by itself. A plastic liner is thermovacuumformed into the paperboard tray or carton in contact with the lamination on the paperboard therein to provide a boilable bakeable liquid-tight leakproof lining for the tray. The strengthened carton structure in outer paperboard supporting structure coated with a plastic or foil film heat resistant at baking temperatures and an inner plastic film or liner for contact with the food if food is the product being packaged. A laminated or multilayer wall tray or carton is provided with a corner construction to resist leaking of vacuumized containers for example, and to form a simple stop for use in nesting of the cartons.
Inventors
- 👤 R Bemiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:42
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/20; B65D5/2052; B29; B29C; B29C51/00; B29C51/16; B29C51/162; B65D21/00; B65D21/02; B65D21/0233; B65D5/2038; B65D5/2047; B65D5/42; B65D5/4212; B65D5/4233; B65D5/56; B65D5/563; Y; Y10; Y10S; Y10S206/00; Y10S206/831; Y10S229/00; Y10S229/902; Y10S229/903
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A tray or carton structure including an outer tray or part of paperboard having a plastic layer secured thereon and having a bottom wall and four sidewalls, said plastic layer covering said bottom wall and said four sidewalls on the interior thereof, an inner tray or part comprising a thermo-vacuumformed layer of film corresponding closely to the inside contour of said outer part of paperboard and engaging said plastic coating, said plastic covered paperboard carton part and said plastic carton part providing mutual reinforcing elements having a combined wall strength to provide for handling as a container for articles.
Claim 2
Dependent Claim
99 words
A tray or carton structure including an outer tray or part of paperboard having a plastic layer secured thereon and having a bottom wall and four sidewalls, said plastic layer covering said bottom wall and said four sidewalls on the interior thereof, an inner tray or part comprising a thermo-vacuumformed layer of film corresponding closely to the inside contour of said outer part of paperboard and engaging said plastic coating, said plastic covered paperboard carton part and said plastic carton part providing mutual reinforcing elements having a combined wall strength to provide for handling as a container for articles.
Claim 3
Dependent Claim
19 words
A tray or carton structure as recited in claim 1, in which said plastic layer is a film layer.
Claim 4
Dependent Claim
20 words
A tray or carton structure as recited in claim 1, in which said plastic layer is a foamed plastic layer.
Claim 5
Dependent Claim
33 words
A tray or carton structure as recited in claim 1, in which said paperboard of said paperboard carton part is provided with an impregnation of a char retardant to increase its temperature resistance.
Claim 6
Dependent Claim
200 words
A tray or carton structure comprising a bottom wall, respective side walls hingedly connected to the four sides of the bottom wall, said side walls having means for permanent interconnection therebetween to hold the side walls in erected position as side walls of the tray or carton, each of the side walls having hingedly connected thereto a flap extension which can be bent about its hinge connection to be placed horizontally and parallel to the bottom wall in the erected position of the side walls where they are permanently connected to each other, one of said flap extensions being extended beyond the width of the adjacent side wall to which it is connected and also overlapping inwardly toward the bottom wall in the opened condition of the carton to overlying the sides of said adjacent side panel, and in the erected position of the carton, said projection beyond the ends of one set of side flaps, serving to match the width of the other side flaps to the other side panels of the carton, and the inward extensions on the side flaps serving to overlap the side flap extension connected to the side walls to enable erecting of the carton.
Claim 7
Dependent Claim
200 words
A tray or carton structure comprising a bottom wall, respective side walls hingedly connected to the four sides of the bottom wall, said side walls having means for permanent interconnection therebetween to hold the side walls in erected position as side walls of the tray or carton, each of the side walls having hingedly connected thereto a flap extension which can be bent about its hinge connection to be placed horizontally and parallel to the bottom wall in the erected position of the side walls where they are permanently connected to each other, one of said flap extensions being extended beyond the width of the adjacent side wall to which it is connected and also overlapping inwardly toward the bottom wall in the opened condition of the carton to overlying the sides of said adjacent side panel, and in the erected position of the carton, said projection beyond the ends of one set of side flaps, serving to match the width of the other side flaps to the other side panels of the carton, and the inward extensions on the side flaps serving to overlap the side flap extension connected to the side walls to enable erecting of the carton.
Claim 8
Dependent Claim
67 words
A tray or carton as described in claim 5, in which each overlapping end extension of said side of one set of side walls is cut away at an angle on the inner edge to provide a portion connected to a side wall which will not fold with the side down into horizontal position but remains projecting as a stop or index for nesting of similar cartons.
Claim 9
Dependent Claim
121 words
A tray or carton of the character described comprising a tray-like structure of paperboard having a coating of plastic thereon with the plastic disposed inwardly with respect to the carton being formed from the paperboard, said carton comprising a bottom wall, respective side walls connected by score lines to the bottom wall, and having means associated with the other side walls for permanent securing of the side walls to each other in erected position of the tray or carton, and a third layer of plastic forming the inside surface of the carton and being thermoformed within the tray to approximate the shape of the inside of the tray and covering all of the interior cut exposed edge portions of the carton.
Claim 10
Dependent Claim
121 words
A tray or carton of the character described comprising a tray-like structure of paperboard having a coating of plastic thereon with the plastic disposed inwardly with respect to the carton being formed from the paperboard, said carton comprising a bottom wall, respective side walls connected by score lines to the bottom wall, and having means associated with the other side walls for permanent securing of the side walls to each other in erected position of the tray or carton, and a third layer of plastic forming the inside surface of the carton and being thermoformed within the tray to approximate the shape of the inside of the tray and covering all of the interior cut exposed edge portions of the carton.
Claim 11
Dependent Claim
36 words
A tray or carton as recited in claim 7, in which the third inner layer of the carton forms a plastic barrier which is shaped to the inside of the carton but is freely detachable therefrom.
Claim 12
Dependent Claim
23 words
A tray or carton as recited in claim 8, and including an insert between said third layer and a wall of the carton.
Claim 13
Dependent Claim
24 words
A tray as recited in claim 8, in which said third plastic layer is transparent and in which graphic material is present behind it.
Claim 14
Dependent Claim
52 words
In a tray or carton as recited in claim 8, in which the third layer of plastic forming the inside wall or surface of the tray or carton is heat sealed to and welded to the plastic coating on the paperboard part of the carton so as to be substantially inteGral therewith.
Claim 15
Dependent Claim
80 words
A tray or carton as recited in claim 5, in which a third layer of plastic is provided forming the inner surface of the carton and covering the inner surface and the side flap extensions forming a flange around the open end of the carton, in which said third layer provides a continuous surface extending around the rim or flange of the carton for heat sealing or attachment to a lid or a covering of similar or compatible plastic material.
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |