US5217768A — Adhesiveless susceptor films and packaging struct…

Claim 1

Independent Claim 107 words

A package material for use in microwave packaging and cooking of food, comprising: a susceptor including: a first substrate with opposed first and second surfaces, said first substrate formed of a heat-sealable material that is transparent to microwaves and that maintains its heat sealable properties at temperatures up to about 500° F.; and a microwave absorptive substrate for receiving microwave energy, the microwave absorptive material covering a sufficient area of the first substrate so that the susceptor will heat when exposed to microwaves; and a dimensionally stable second substrate including a heat-sealable material, the second substrate heat-sealed to at least the second surface of the first substrate.

Claim 2

Dependent Claim 107 words

A package material for use in microwave packaging and cooking of food, comprising: a susceptor including: a first substrate with opposed first and second surfaces, said first substrate formed of a heat-sealable material that is transparent to microwaves and that maintains its heat sealable properties at temperatures up to about 500° F.; and a microwave absorptive substrate for receiving microwave energy, the microwave absorptive material covering a sufficient area of the first substrate so that the susceptor will heat when exposed to microwaves; and a dimensionally stable second substrate including a heat-sealable material, the second substrate heat-sealed to at least the second surface of the first substrate.

Claim 3

Dependent Claim 15 words

The package material of claim 1, wherein the heat-sealable polymeric- material is an amorphous polyester.

Claim 4

Dependent Claim 45 words

The package material of claim 2, wherein the microwave absorptive material comprises a metal-containing material selected from the group consisting of a single metal, a metal alloy, a metal oxide, a mixture of metal oxides, a dispersion of metals, and any combination of the foregoing.

Claim 5

Dependent Claim 24 words

The package material of claim 2, wherein the second substrate is selected from the group consisting of paper, amorphous polyester-coated paper, and clay-coated paper.

Claim 6

Dependent Claim 102 words

A composite for use in a microwave oven formed into a shape sufficient to enclose a food product to be cooked, the composite comprising: a flexible first substrate, the first substrate comprising a heat-sealable polymeric material having opposed first and second surfaces, the material transparent to microwaves; and a microwave absorptive layer deposited on the first surface of the first substrate, the microwave absorptive layer covering a sufficient area of the first surface so that the composite will heat when microwaves contact the absorptive layer; a dimensionally stable second substrate comprising a heat-sealable material that is heat-sealed to the microwave absorptive layer.

Claim 7

Dependent Claim 102 words

A composite for use in a microwave oven formed into a shape sufficient to enclose a food product to be cooked, the composite comprising: a flexible first substrate, the first substrate comprising a heat-sealable polymeric material having opposed first and second surfaces, the material transparent to microwaves; and a microwave absorptive layer deposited on the first surface of the first substrate, the microwave absorptive layer covering a sufficient area of the first surface so that the composite will heat when microwaves contact the absorptive layer; a dimensionally stable second substrate comprising a heat-sealable material that is heat-sealed to the microwave absorptive layer.

Claim 8

Dependent Claim 43 words

The package material of claim 1, wherein said dimensionally stable second substrate is heat-sealed to a surface of the first substrate to provide a configuration in which the microwave absorptive layer and first substrate are heat-sealed between layers of dimensionally stable second substrates.

Claim 9

Dependent Claim 13 words

The composite of claim 6, wherein the heat-sealable material is an amorphous polyester.

Claim 10

Dependent Claim 43 words

The composite of claim 1, wherein said first substrate that is heat-sealed is in the form of a geometric pattern, the pattern providing selective absorption of microwave energy so that only a part of the microwave energy contacting can pass through the composite.

Claim 11

Dependent Claim 44 words

The composite of claim 7, wherein the microwave absorptive layer comprises a metal-containing material selected from the group consisting of a single metal, a metal alloy, a metal oxide, a mixture of metal oxides, a dispersion of metals, and any combination of the foregoing.

Claim 12

Dependent Claim 116 words

A package for cooking a food product in a microwave oven, comprising: a first substrate having opposed first and second surfaces, the first substrate comprising a heat-sealable amorphous polyester having the characteristics of Table I; a microwave absorptive layer affixed to a first surface of the first substrate, the microwave absorptive layer comprising a material that increases in temperature when exposed to microwave energy; and a dimensionally stable second substrate comprising a material that includes a heat-sealable amorphous polyester having the characteristics of a density of 1.26 (g/cc), a melt point of 265° C., elongation of 300-500% and secant modulus of 1430 Mpa, the dimensionally stable second substrate heat-sealed to at least the microwave absorptive layer.

Claim 13

Dependent Claim 116 words

A package for cooking a food product in a microwave oven, comprising: a first substrate having opposed first and second surfaces, the first substrate comprising a heat-sealable amorphous polyester having the characteristics of Table I; a microwave absorptive layer affixed to a first surface of the first substrate, the microwave absorptive layer comprising a material that increases in temperature when exposed to microwave energy; and a dimensionally stable second substrate comprising a material that includes a heat-sealable amorphous polyester having the characteristics of a density of 1.26 (g/cc), a melt point of 265° C., elongation of 300-500% and secant modulus of 1430 Mpa, the dimensionally stable second substrate heat-sealed to at least the microwave absorptive layer.

Claim 14

Dependent Claim 87 words

An adhesiveless susceptor film comprising a plurality of layers, aid adhesiveless susceptor film comprising a first substrate layer that includes an amorphous polyester, said layer having opposed surfaces, said first substrate layer having a microwave energy-absorptive layer deposited on one of said opposed surfaces; and a dimensionally stable substrate layer containing a heat-sealable material that is heat-sealed to at least said microwave absorptive layer, wherein adjacent layers that are heat-sealed to each other are heat-sealed to each other on only a portion of their respective surface areas.

Claim 15

Dependent Claim 87 words

An adhesiveless susceptor film comprising a plurality of layers, aid adhesiveless susceptor film comprising a first substrate layer that includes an amorphous polyester, said layer having opposed surfaces, said first substrate layer having a microwave energy-absorptive layer deposited on one of said opposed surfaces; and a dimensionally stable substrate layer containing a heat-sealable material that is heat-sealed to at least said microwave absorptive layer, wherein adjacent layers that are heat-sealed to each other are heat-sealed to each other on only a portion of their respective surface areas.

Claim 16

Dependent Claim 46 words

The adhesiveless susceptor of claim 11, wherein said first substrate layer is in the form of a geometric pattern, the pattern providing varying degrees of resistivity of said absorptive layer, so that only a part of the microwave energy can pass through the adhesiveless susceptor film.

Claim 17

Dependent Claim 22 words

The package material of claim 1, wherein said dimensionally stable second substrate is heat-sealed to a peripheral portion of said first substrate.

Claim 18

Dependent Claim 19 words

The susceptor of claim 17, wherein said adjacent layers are heat-sealed to each other at their respective peripheral surfaces.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-06-07	1996-12-07	1997-06-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-06-07	2000-12-07	2001-06-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-06-07	2004-12-07	2005-06-08	$7700.00	Window Closed / Lapsed

Adhesiveless susceptor films and packaging structures

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