Center-supported microwave tray

• US 4,801,774 A
• Filed: 11/24/1987
• Issued: 01/31/1989
• Est. Priority Date: 11/24/1987
• Status: Expired due to Fees

• Current Assignee: Container Corporation of America (Smurfit-Stone Container Corporation)
• Original Assignee: Container Corporation of America (Smurfit-Stone Container Corporation)
• Inventors: Hart, Joseph J.
• Primary Examiner(s): Hornsby, Harvey C.
• Assistant Examiner(s): Machuga, Joseph S.
• Application Number:
  US07/125,695
• Time in Patent Office: 434 Days
• Field of Search: 229/104, 229/16 R, 229/16 D, 229/120, 229/120.16, 229/903, 219/10.55 E, 219/10.55 F, 99/422, 99/426, 99/448, 99/449, 99/451, 99/DIG. 14, 99/646 C, 248/174, 248/459, 248/460, 248/469, 248/472, 426/107, 426/113, 426/234, 426/237, 426/241, 426/243, 426/244, 426/126, 206/45.21, 206/45.22, 206/45.25, 206/45.26, 206/45.29, 206/45.14, 206/45.19
• US Class Current: 219/730
• CPC Class Codes: B65D 2581/3406 Pizza or bread
• CPC Class Codes: B65D 2581/344 Geometry or shape factors influencing the microwave heating properties
• CPC Class Codes: B65D 2581/3494 Microwave susceptor B65D2581/3487 takes precedence
• CPC Class Codes: B65D 5/48004 Squaring, i.e. at least four not aligned compartments
• CPC Class Codes: B65D 81/3453 Rigid containers, e.g. trays, bottles, boxes, cups
• CPC Class Codes: H05B 6/6408 Supports or covers specially adapted for use in microwave heating apparatus
• CPC Class Codes: Y10S 229/903 Ovenable, i.e. disclosed to be placed in an oven
• CPC Class Codes: Y10S 99/14 Induction heating

Abstract

A disposable, self-supported tray, for holding food in a microwave oven, which tray includes a paperboard center panel coated on at least one side with a conductive material and supported at the periphery and in the center by downwardly extending panels, certain of which have interlocking engagement with each other.

Claims

1. A disposable, one-piece, self-supported tray for holding food in a microwave oven, said tray being formed from a unitary blank of dielectric, foldable sheet material, such as paperboard, and comprising:

(a) a center panel having a periphery, a center portion, a plurality of side edges, at least one surface, and a relatively thin layer of conductive material on said one surface;

(b) a plurality of side panels foldably joined to each other and to said side edges and extending downwardly therefrom for supporting said center panel at said periphery;

(c) an integral supporting structure, for supporting said center panel center portion, including;

(i) first and second support panels formed soley from material cut from said center panel and foldably joined thereto along intersecting fold lines extending normal to each other;

(ii) said support panels being disposed to extend downwardly from and normal to said center panel;

(iii) said first support panel having an opening therein and an abutment projecting into said opening;

(iv) said second support panel including a pair of co-planer sections separated by a relatively narrow opening for receiving and engaging the abutment of said first support panel, when one of said second support panel sections is received within said first support panel opening, to maintain said support members in interlocking relationship.

2. A disposable, one-piece, self-supported tray for holding food in a microwave oven, said tray being formed from a unitary blank of dielectric, foldable sheet material, such as paperboard, and comprising:

(a) a center panel having a periphery, a center portion, a plurality of side edges, at least one surface, and a relatively thin layer of conductive material on said one surface;

(b) a plurality of side panels foldably joined to each other and to said side edges and extending downwardly therefrom for supporting said center panel at said periphery;

(c) an integral supporting structure, for supporting said center panel center portion, including;

(i) first and second support panels formed soley from material cut from said center panel and foldably joined thereto along intersecting fold lines extending normal to each other;

(ii) said support panels being disposed to extend downwardly from and normal to said center panel and having interlocking engagement with each other;

(iii) one of said support panels having a portion received within an opening in the other support panel to provide said interlocking engagement between said support panels.

3. A disposable, one-piece, self-supported tray for holding food in a microwave oven, said tray being formed from a unitary blank of dielectric, foldable sheet material, such as paperboard, and comprising:

(a) a center panel having a periphery, a center portion, a plurality of side edges, at least one surface, and a relatively thin layer of conductive material on said one surface;

(b) a plurality of side panels foldably joined to each other and to said side edges and extending downwardly therefrom for supporting said center panel at said periphery;

(c) an integral supporting structure, for supporting said center panel center portion, including;

(i) first and second support panels formed soley from material cut from said center panel and foldably joined thereto along intersecting fold lines;

(ii) said support panels being disposed to extend downwardly from and normal to said center panel and having interlocking engagement with each other to maintain them in supporting position.

4. A tray according to claim 3, wherein when said support panels are folded downwardly into supporting position, and wherein a portion of said second panel is received within an opening in said first support panel.

5. A tray according to claim 4, wherein said second support panel has a lock tab engageable with an abutment projecting into said first panel opening to maintain said panels in interlocking engagement.

6. A tray according to claim 4, wherein said second support panel includes a pair of sections partially separated from each other by a slit, and wherein a portion of said first support panel is received within said slit, so that second support panel sections are disposed on opposite sides of said first support panel.