Patent US4592914A successfully refreshed from Google Patents.
US4592914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-blank disposable container for microwave food cooking
Assignee: Graphic Packaging International LLC
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Filing: 1983-06-15
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Granted: 1986-06-03
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Expires: 2003-06-15
Abstract
Abstract A two piece container (2) for cooking food in a microwave oven including an outer package (4, 60) formed from a single blank having a removable section (8, 72, 74, 80c) for exposing water vapor ventilation holes and an inner food supporting tray (6, 48). In one embodiment, the inner food supporting tray (6) is formed from a single blank and having V-shaped support legs (44 and 46) to raise the food supporting surface (38) above the surface of the outer package. The material from which the outer package is made has a vapor absorptive characteristic. The inner food supporting tray (6, 48) is completely coated on one side with a microwave absorptive material for heating up to brown or crisp the surface of food in contact with the tray (6) and may be, in addition, coated with a stick and grease resistant material. In one embodiment of the outer package (4), a microwave reflective shielding layer is included on an inner top panel (34) to prevent overcooking of the top of food contained within the container. A method for efficiently laminating the microwave reflective layer to paperboard stock for forming the outer package means is also disclosed.
Inventors
- 👤 Morris W. Kuchenbecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:05
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D81/3453; B65D2205/00; B65D2581/00; B65D2581/34; B65D2581/3401; B65D2581/3402; B65D2581/3405; B65D2581/3406; B65D2581/3437; B65D2581/3471; B65D2581/3472; B65D2581/3486; B65D2581/3489; B65D2581/3494; Y; Y10; Y10S; Y10S229/00; Y10S229/902; Y10S229/903
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
353 words
A container for use in heating food in a microwave oven, comprising: (a) outer package means constructed in a manner for containing and partially shielding food contained therein from microwaves and for providing an escape route for gas vapor generated during heating of the food; and (b) food supporting means for supporting the food and provided with a microwave interactive layer for converting microwave energy to heat so as to crisp a surface of the food supported thereon; wherein said food supporting means is formed of a central food support panel flanked by at least a pair of leg flaps that are connected to the central food support panel by respective fold lines; wherein said food supporting means is temporarily convertible from a flat configuration into a non-self-sustaining support tray configuration having said leg flaps folded relative to said central food support panel in an manner providing support leg portions extending downwardly with respect to the central food support panel and wall portions extending upwardly relative thereto; wherein said food supporting means is retainable in said support tray configuration within said outer package means solely by virtue of the relative size and configuration of the outer package means relative to that of said food supporting means when it is in said support tray configuration; and wherein said food supporting means is operative for converting back substantially into said flat configuration forming a cutting surface for the food when said food supporting means is removed, with the food thereon, from the outer packaging means after the food has been heated, due to the none-self-sustaining nature of said support tray configuration, wherein said leg flaps are laterally opposed multi-sectioned leg flaps, said laterally opposed multi-sectioned leg flaps being foldable into an upwardly open V-shape extending the length of side edges of said food support panel to which they are connected by said respective fold lines, so as to form supporting legs to raise said central food support panel above the bottom of said outer package means to insulate the bottom panel of the outer package means from heat generated during the microwave absorptive cooking process.
Claim 2
Dependent Claim
353 words
A container for use in heating food in a microwave oven, comprising: (a) outer package means constructed in a manner for containing and partially shielding food contained therein from microwaves and for providing an escape route for gas vapor generated during heating of the food; and (b) food supporting means for supporting the food and provided with a microwave interactive layer for converting microwave energy to heat so as to crisp a surface of the food supported thereon; wherein said food supporting means is formed of a central food support panel flanked by at least a pair of leg flaps that are connected to the central food support panel by respective fold lines; wherein said food supporting means is temporarily convertible from a flat configuration into a non-self-sustaining support tray configuration having said leg flaps folded relative to said central food support panel in an manner providing support leg portions extending downwardly with respect to the central food support panel and wall portions extending upwardly relative thereto; wherein said food supporting means is retainable in said support tray configuration within said outer package means solely by virtue of the relative size and configuration of the outer package means relative to that of said food supporting means when it is in said support tray configuration; and wherein said food supporting means is operative for converting back substantially into said flat configuration forming a cutting surface for the food when said food supporting means is removed, with the food thereon, from the outer packaging means after the food has been heated, due to the none-self-sustaining nature of said support tray configuration, wherein said leg flaps are laterally opposed multi-sectioned leg flaps, said laterally opposed multi-sectioned leg flaps being foldable into an upwardly open V-shape extending the length of side edges of said food support panel to which they are connected by said respective fold lines, so as to form supporting legs to raise said central food support panel above the bottom of said outer package means to insulate the bottom panel of the outer package means from heat generated during the microwave absorptive cooking process.
Claim 3
Dependent Claim
88 words
A container as defined in claim 1, wherein said central food support panel has a width dimension which is less than the width dimension of the outer package means in the plane of said central food support panel in order to permit said central food support panel to be erected into said support tray configuration and inserted into the outer package means without causing said sections of each of the V-shaped support legs to physically contact each other, thereby reducing the possibility of charring of said support legs.
Claim 4
Dependent Claim
78 words
A container as defined in claim 1, wherein the length of the outer section of each of the laterally opposed multi-sectioned leg flaps comprising the V-shaped support legs, when erected, approximately equals the vertical height of said outer package means to minimize movement of the food supporting means after it has been inserted into said outer package means and to assist in preventing the V-shaped support legs from deflecting to a position under the central food support panel.
Claim 5
Dependent Claim
67 words
A container as defined in claim 1, wherein the central food support panel is also flanked by a pair of reinforcing flaps that are connected thereto by respective fold lines, said reinforcing flaps being folded relative to the central food support panel for preventing bowing of the central food support panel under the weight of food supported thereon above a bottom wall of the outer package means.
Claim 6
Dependent Claim
48 words
A container as defined in claim 1, wherein said food supporting means is formed of a single unitary outer blank that is made from water vapor absorptive material to absorb water vapor emitted from the food during heating thereby preventing reabsorption of the water vapor by the food.
Claim 7
Dependent Claim
22 words
A container as defined in claim 1, wherein said microwave interactive layer means is coated with a stick and grease resistant layer.
Claim 8
Dependent Claim
18 words
A container according to claim 6, wherein said microwave interactive layer comprises a metallized layer of polyester film.
Claim 9
Dependent Claim
57 words
A container as defined in claim 1, wherein the entire upper surface of a single unitary inner paperboard blank forming said food supporting means is coated with a continuous layer of microwave absorptive material, which becomes heated when exposed to microwaves to crisp the surface of the food placed in contact therewith, as said microwave interactive layer.
Claim 10
Dependent Claim
34 words
A container as defined in claim 8, wherein the microwave absorptive material is coated with a grease resistant, heat resistant release coating to facilitate removal of food from said food supporting means after heating.
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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) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |