Patent US4870233A successfully refreshed from Google Patents.
US4870233A
Expired / Lapsed
US
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Metal tray and susceptor combination for use in microwave ovens
Assignee: General Mills Inc
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Filing: 1988-09-19
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Granted: 1989-09-26
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Expires: 2008-09-19
Abstract
Abstract A metal tray has its inner and outer surfaces coated with a plastic material. Within the tray is a first susceptor unit which includes a layer of corrugated paperboard composed of A-flutes secured to the underside of a substrate having a metallized foil secured to its upper side. A food item to be heated is supported on the first susceptor unit. A second susceptor unit overlies the food item, the second susceptor unit having a downturned flange inserted between one side of the tray and one side of the food item.
Inventors
- 👤 Duane L. McDonald
- 👤 Lynn H. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:26
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/24; B65D81/26; B65D81/261; B65D81/34; B65D81/3446; B65D81/3453; B65D2205/00; B65D2581/00; B65D2581/34; B65D2581/3401; B65D2581/3402; B65D2581/3412; B65D2581/3413; B65D2581/3437; B65D2581/3471; B65D2581/3472; B65D2581/3486; B65D2581/3494; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
185 words
A package combination for use in a microwave oven comprising a metal tray including a bottom wall and a continuous side wall extending upwardly from said bottom wall and forming an open top, the inner and outer surfaces of said walls having a plastic coating thereon, a first susceptor unit including a metallized film, a dielectric substrate integral with said film and a layer of corrugated dielectric material secured to the underside of said substrate, said first susceptor unit being loosely received in said tray with said corrugated layer engaging said bottom wall so as to locate said metallized film in a raised or spaced relation with respect to said bottom wall, a foot item on said first susceptor unit, and a second susceptor unit generally closing said open top and loosely overlying a substantial portion of the food item including a metallized film and a layer of dielectric material thereabove, said second susceptor unit constituting the sole means overlying said food item so that microwave energy is permitted to enter said metal tray only through its said open top and said second susceptor unit.
Claim 2
Dependent Claim
185 words
A package combination for use in a microwave oven comprising a metal tray including a bottom wall and a continuous side wall extending upwardly from said bottom wall and forming an open top, the inner and outer surfaces of said walls having a plastic coating thereon, a first susceptor unit including a metallized film, a dielectric substrate integral with said film and a layer of corrugated dielectric material secured to the underside of said substrate, said first susceptor unit being loosely received in said tray with said corrugated layer engaging said bottom wall so as to locate said metallized film in a raised or spaced relation with respect to said bottom wall, a foot item on said first susceptor unit, and a second susceptor unit generally closing said open top and loosely overlying a substantial portion of the food item including a metallized film and a layer of dielectric material thereabove, said second susceptor unit constituting the sole means overlying said food item so that microwave energy is permitted to enter said metal tray only through its said open top and said second susceptor unit.
Claim 3
Dependent Claim
18 words
A package combination in accordance with claim 1 in which said corrugated dielectric material is composed of A-flutes.
Claim 4
Dependent Claim
30 words
A package combination in accordance with claim 1 in which said second susceptor unit includes a downturned means disposed between said food item and a section of said side wall.
Claim 5
Dependent Claim
160 words
A package combination for use in a microwave oven comprising a metal tray including a bottom wall and a continuous side wall extending upwardly from said bottom wall, the inner and outer surfaces of said walls having a plastic coating thereon, a first susceptor unit including a metallized film, a dielectric substrate integral with said film and a layer of corrugated dielectric material secured to the underside of said substrate, said first susceptor unit being loosely received in said tray with said corrugated layer engaging said bottom wall so as to locate said metallized film in a raised or spaced relation with respect to said bottom wall, a food item on said first susceptor unit, and a second susceptor unit loosely overlying a substantial portion of the food item including a metallized film and a layer of dielectric material thereabove, said second susceptor unit including a downturned flange disposed between said food item and a section of said side wall.
Claim 6
Dependent Claim
160 words
A package combination for use in a microwave oven comprising a metal tray including a bottom wall and a continuous side wall extending upwardly from said bottom wall, the inner and outer surfaces of said walls having a plastic coating thereon, a first susceptor unit including a metallized film, a dielectric substrate integral with said film and a layer of corrugated dielectric material secured to the underside of said substrate, said first susceptor unit being loosely received in said tray with said corrugated layer engaging said bottom wall so as to locate said metallized film in a raised or spaced relation with respect to said bottom wall, a food item on said first susceptor unit, and a second susceptor unit loosely overlying a substantial portion of the food item including a metallized film and a layer of dielectric material thereabove, said second susceptor unit including a downturned flange disposed between said food item and a section of said side wall.
Claim 7
Dependent Claim
20 words
A package combination in accordance with claim 13 in which said flange also includes a portion of said metallized film.
Claim 8
Dependent Claim
19 words
A package combination in accordance with claim 5 in which said flange is formed by a weakened fold line.
Claim 9
Dependent Claim
21 words
A package combination in accordance with claim 6 in which said second susceptor unit has a plurality of slits formed therein.
Claim 10
Dependent Claim
39 words
A package combination in accordance with claim 7 in which said first susceptor unit includes a plurality of perforations formed therein so that any oils can drain downwardly into the voids formed by the flutes of said corrugated layer.
Claim 11
Dependent Claim
99 words
A package combination comprising a metal tray having its inner and outer surfaces covered with a plastic coating, a first susceptor unit in said tray including a metallized film and a layer of corrugated dielectric material secured therebeneath, at least one food item to be heated supported on the metallized film of said first susceptor unit, and a second susceptor unit overlying said food item including a metallized film and a layer of dielectric material secured thereabove, said second susceptor unit having a downward flange inserted between one side of said tray and one side of said food item.
Claim 12
Dependent Claim
99 words
A package combination comprising a metal tray having its inner and outer surfaces covered with a plastic coating, a first susceptor unit in said tray including a metallized film and a layer of corrugated dielectric material secured therebeneath, at least one food item to be heated supported on the metallized film of said first susceptor unit, and a second susceptor unit overlying said food item including a metallized film and a layer of dielectric material secured thereabove, said second susceptor unit having a downward flange inserted between one side of said tray and one side of said food item.
Claim 13
Dependent Claim
25 words
A package combination in accordance with claim 9 in which said flange includes a continuation of said metallized film and said layer of dielectric material.
Claim 14
Dependent Claim
35 words
A package combination in accordance with claim 10 in which said metal tray includes a bottom wall and a continuous side wall, said flange having a width approximately one-half the height of said side wall.
Claim 15
Dependent Claim
25 words
A package combination in accordance with claim 11 in which said corrugated dielectric material raises said metallized film approximately 3/16 inch above said bottom wall.
Claim 16
Dependent Claim
32 words
A package combination in accordance with claim 12 in which said corrugated dielectric material is composed of A-flutes to raise said metallized film said approximately 3/16 inch to above said bottom wall.
References Cited (Backward Citations)
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |