Patent US5758085A successfully refreshed from Google Patents.
Patent US3779447A successfully refreshed from Google Patents.
US3779447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boilable bakeable package and method
Assignee: Robalex Inc
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Filing: 1971-06-21
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Granted: 1973-12-18
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Expires: 1991-06-21
Abstract
Abstract A laminated or multi-layer wall tray is provided which has a self-supporting outer layer or wall portion of paperboard which can be formed and handled as an independent self-supporting unit during manufacture of the laminated tray. A plastic liner is heat-vacuum formed into the paperboard tray or carton to provide a boilable, bakeable, liquid-tight, leakproof lining for the tray which in its entirety is of a boilable or bakeable character, and to provide a strengthened structure of the composite tray of the outer paperboard supporting structure and inner plastic film liner in supporting structure. Both the liner and the paperboard are preferably made of a thinness or caliper of a dimension less than can be normally employed in such structures when used alone. At the bottom the paperboard outer structure has certain formed indents around its bottom corner edge which provide resting portions or stops for nesting of the tapered trays to be handled as a stack, and also provide exit openings or vents for air from within the carton or tray at required positions to the outside during the thermo-vacuum forming of the liner. The method of fabricating or combining the components of such a tray comprises the steps of forming the outer paperboard structure or layer with the corners locked or secured together in self-supporting fashion to receive the plastic liner by thermo-vacuum forming process drawn inside of the self supported paperboard outer structure to correspond identically to the inner profile of the paperboard container thereby locking and if desired, adhering the molten plastic material to the inside paperboard structure. A laterally horizontally extending flange may be provided around the upper edge of either the paperboard or the plastic, or both.
Inventors
- 👤 R Bemiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:31
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3415; B29; B29C; B29C33/00; B29C33/10; B29C51/00; B29C51/16; B29C51/162; B65B; B65B1/00; B65B1/02; B65D5/00; B65D5/42; B65D5/56; Y; Y10; Y10S; Y10S229/00; Y10S229/90; Y10S229/902; Y10S229/903; Y10S229/93; Y10S229/931
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
133 words
A tray or carton structure including an outer tray or part of paperboard having a bottom wall and four side walls, an inner tray or part comprising a thermo-vacuum formed layer of film conforming closely to the inside contour of said outer part of paperboard, said paperboard part and said film part individually lacking wall strength sufficient for handling as an individual container but together providing mutual reinforcing elements having a combined wall strength to provide for handling as a container for food or the like, and an interface between said film part and paperboard part being devoid of an adhesive the corners of the tray structure are formed by recessed blunt score lines facing outwardly and in which a series of apertures extend outwardly from each corner along said blunt score lines.
Claim 2
Dependent Claim
133 words
A tray or carton structure including an outer tray or part of paperboard having a bottom wall and four side walls, an inner tray or part comprising a thermo-vacuum formed layer of film conforming closely to the inside contour of said outer part of paperboard, said paperboard part and said film part individually lacking wall strength sufficient for handling as an individual container but together providing mutual reinforcing elements having a combined wall strength to provide for handling as a container for food or the like, and an interface between said film part and paperboard part being devoid of an adhesive the corners of the tray structure are formed by recessed blunt score lines facing outwardly and in which a series of apertures extend outwardly from each corner along said blunt score lines.
Claim 3
Dependent Claim
38 words
A tray structure as recited in claim 1, in which the series of apertures have a sufficiently small diameter of about 0.005 inch to 0.010 inch so as to preclude drawing of the film part into the openings.
Claim 4
Dependent Claim
52 words
A laminated container comprising an outer container, an inner liner of plastic material vacuum formed in situ within said outer container, a view opening in said outer container, a portion of said liner being in spanning relationship to said opening, and said liner portion being housed entirely interiorly of said outer container.
Claim 5
Dependent Claim
52 words
A laminated container comprising an outer container, an inner liner of plastic material vacuum formed in situ within said outer container, a view opening in said outer container, a portion of said liner being in spanning relationship to said opening, and said liner portion being housed entirely interiorly of said outer container.
Claim 6
Dependent Claim
25 words
The laminated container as defined in claim 3 wherein said outer container has a bottom wall, and said view opening is in said bottom wall.
Claim 7
Dependent Claim
25 words
The laminated container as defined in claim 3 wherein said outer container has a body wall, and said view opening is in said body wall.
Claim 8
Dependent Claim
25 words
The laminated container as defined in claim 3 wherein said outer container has body and bottom walls, and said view opening is in said walls.
Claim 9
Dependent Claim
41 words
The laminated container as defined in claim 3 including a lid secured to said inner liner, and said liner and outer container being in releasable relationship whereby the liner with its lid secured thereto may be removed from said outer container.
Claim 10
Dependent Claim
86 words
A laminated container comprising an outer paperboard container blank folded to define an outer container, an inner liner of plastic material vacuum formed in situ within said outer container, said outer container having a flangeless terminal uppermost edge, and said liner having a peripheral flange projecting, radially beyond said terminal uppermost edge, said container including a view opening in said outer container, a portion of said liner being in spanning relationship to said opening, and said liner portion being housed entirely interiorly of said outer container.
Claim 11
Dependent Claim
86 words
A laminated container comprising an outer paperboard container blank folded to define an outer container, an inner liner of plastic material vacuum formed in situ within said outer container, said outer container having a flangeless terminal uppermost edge, and said liner having a peripheral flange projecting, radially beyond said terminal uppermost edge, said container including a view opening in said outer container, a portion of said liner being in spanning relationship to said opening, and said liner portion being housed entirely interiorly of said outer container.
Claim 12
Dependent Claim
186 words
A product package comprising an outer paperboard container blank folded along fold lines to define an outer container having body panels and a bottom panel, said body panel terminating in an uppermost flangeless edge, an inner liner of plastic material vacuum formed in situ within said outer container and being in releasable engagement therewith, a product in said liner, a lid heat sealed to a flange of said outer container whereby said liner, product and lid may be withdrawn as a unit from said outer container, said body panels being in upwardly divergent relationship to said bottom panel, inwardly indented portions of said body panels providing stop means for nesting of similar packages in the absence of lids and products and providing openings for communication with a source of vacuum, said stop means being struck out portions of said body and bottom panels, said liner having portions thereof extending into said openings, a view opening in at least one of said panels, a portion of said liner being in spanning relationship to said opening, and said liner portion being housed entirely interiorly of said outer container.
Claim 13
Dependent Claim
186 words
A product package comprising an outer paperboard container blank folded along fold lines to define an outer container having body panels and a bottom panel, said body panel terminating in an uppermost flangeless edge, an inner liner of plastic material vacuum formed in situ within said outer container and being in releasable engagement therewith, a product in said liner, a lid heat sealed to a flange of said outer container whereby said liner, product and lid may be withdrawn as a unit from said outer container, said body panels being in upwardly divergent relationship to said bottom panel, inwardly indented portions of said body panels providing stop means for nesting of similar packages in the absence of lids and products and providing openings for communication with a source of vacuum, said stop means being struck out portions of said body and bottom panels, said liner having portions thereof extending into said openings, a view opening in at least one of said panels, a portion of said liner being in spanning relationship to said opening, and said liner portion being housed entirely interiorly of said outer container.
Claim 14
Dependent Claim
92 words
A laminated container comprising an outer paperboard container blank folded to define an outer container, an inner liner of plastic material vacuum formed in situ within said outer container, said outer container having a flangeless terminal uppermost edge, and said liner having a peripheral flange projecting, radially beyond said terminal uppermost edge, said container including a lid bonded to said flange, a product in said line, and said liner and outer container being in releasable relationship whereby said liner, product and lid can be withdrawn as a unit from said outer container.
Claim 15
Dependent Claim
92 words
A laminated container comprising an outer paperboard container blank folded to define an outer container, an inner liner of plastic material vacuum formed in situ within said outer container, said outer container having a flangeless terminal uppermost edge, and said liner having a peripheral flange projecting, radially beyond said terminal uppermost edge, said container including a lid bonded to said flange, a product in said line, and said liner and outer container being in releasable relationship whereby said liner, product and lid can be withdrawn as a unit from said outer container.
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |