Microwave carton

• US 4,836,439 A
• Filed: 01/26/1988
• Issued: 06/06/1989
• Est. Priority Date: 01/26/1988
• Status: Expired due to Fees

• Current Assignee: Container Corporation of America (WestRock Company)
• Original Assignee: Container Corporation of America (WestRock Company)
• Inventors: Hart, Joseph J.
• Primary Examiner(s): Marcus, Stephen
• Assistant Examiner(s): Elkins, Gary E.
• Application Number:
  US07/148,604
• Time in Patent Office: 497 Days
• Field of Search: 229/104, 229/112, 229/120, 229/126, 229/160, 229/163, 229/169, 229/186, 229/902, 229/903, 229/906, 229/DIG. 14, 219/10.55 E, 426/107, 426/109, 426/113, 426/114
• US Class Current: 229/104
• CPC Class Codes: B65D 2581/3494 Microwave susceptor B65D2581/3487 takes precedence
• CPC Class Codes: B65D 5/4295 Ventilating arrangements, e.g. openings, space elements
• CPC Class Codes: B65D 81/3453 Rigid containers, e.g. trays, bottles, boxes, cups
• CPC Class Codes: Y10S 229/903 Ovenable, i.e. disclosed to be placed in an oven

Abstract

A disposable, collapsible, sleeve-type, microwave carton, formed from a unitary blank of foldable paperboard, at least partly coated with a discontinuous layer of electrically conductive material, and comprising top, bottom, side and end walls foldably joined to each other, wherein the top wall is substantially wider than the bottom wall and is partially supported by a pair of retaining panels extending laterally from upper edges of the side walls.

Claims

1. A disposable, collapsible, sleeve-type carton, coated on at least one surface thereof with a discontinuous layer of electrically conductive material and adapted to hold an item of food for browning a surface thereof when subjected to microwave radiation, said carton being formed from a unitary blank of foldable paperboard and comprising:

(a) top and bottom walls foldably joined to each other by opposed end walls to form a tubular structure open at the sides;

(b) said bottom wall having substantially the same length as but substantially less width than said top wall;

(c) said end walls being generally trapezoidal in shape and having parallel top and bottom edges and inclined side edges;

(d) a pair of side walls foldably joined to respective side edges of said bottom wall and extending upwardly to said top wall to close the sides of said tubular structure;

(e) each of said side walls being joined at each end thereof to a related end wall by a generally triangular web which is foldably joined along adjacent edges to an end edge of said side wall and to a side edge of a related end wall;

(f) each of said side walls having foldably joined to an upper edge thereof a retaining panel disposed to extend normal to said side wall and to underlie said top wall and provide additional support for said top wall;

(g) one of said bottom and side walls having at least one vent opening extending therethrough.