US4671982A — Composite foil

Claim 1

Independent Claim 62 words

A composite foil comprising: at least one first layer, said first layer being insoluble in pH neutral water, non-porous and being an extruded thermoplastic material; at least one second layer connected to said first layer, said second layer containing an solubilizer capable of dissolving said first layer when said second layer is wetted; and, said connected first and second layers being self-supporting.

Claim 2

Dependent Claim 62 words

A composite foil comprising: at least one first layer, said first layer being insoluble in pH neutral water, non-porous and being an extruded thermoplastic material; at least one second layer connected to said first layer, said second layer containing an solubilizer capable of dissolving said first layer when said second layer is wetted; and, said connected first and second layers being self-supporting.

Claim 3

Dependent Claim 14 words

A composite foil as claimed in claim 1, wherein said second layer is water-soluble.

Claim 4

Dependent Claim 16 words

A composite foil as claimed in claim 2, wherein said second layer is at least semi-rigid.

Claim 5

Dependent Claim 26 words

A composite foil as claimed in claim 3, wherein said second layer contains fillers selected from the group consisting of mineral fillers and fibrous filler material.

Claim 6

Dependent Claim 26 words

A composite foil as claimed in claim 1, wherein said second layer contains fillers selected from the group consisting of mineral fillers and fibrous filler material.

Claim 7

Dependent Claim 42 words

A composite foil as claimed in claim 1, wherein: said second layer is fibrous material structurally shaped and formed as at least one of paper, cardboard and pasteboard; and said second is further comprised of a water-soluble binder for said fibrous material.

Claim 8

Dependent Claim 53 words

A composite foil as claimed in claim 1, wherein: said second layer is fibrous material structurally shaped and formed of at least one of paper, cardboard and pasteboard; and said second layer is further comprised of a binder for said fibrous material which is soluble in said solubilizer contained in said second layer.

Claim 9

Dependent Claim 13 words

A composite foil as claimed in claim 1, wherein said foil is shaped.

Claim 10

Dependent Claim 20 words

A composite foil as claimed in claim 8, wherein said shaped composite foil is in the form of a box.

Claim 11

Dependent Claim 16 words

A composite foil as claimed in claim 1, further comprising printing on one of said layers.

Claim 12

Dependent Claim 23 words

A composite foil as claimed in claim 1, wherein at least one of said layers is at least partially comprised of flocculation agents.

Claim 13

Dependent Claim 31 words

A composite foil as claimed in claim 1, wherein at least one of said layers is at least partially comprised of materials which produce flocculation agents when said layers is dissolved.

Claim 14

Dependent Claim 28 words

A composite foil as claimed in claim 1, wherein at least one of said layers is at least partially comprised of materials which after dissolution have soil-improving properties.

Claim 15

Dependent Claim 28 words

A composite foil as claimed in claim 1, wherein at least one of said layers is at least partially comprised of materials which after dissolution have soil-fertilizing properties.

Claim 16

Dependent Claim 29 words

A composite foil as claimed in claim 1, wherein: said second layer is comprised of thermoplastic material; and, said solubilizing agent is also capable of dissolving said second layer.

Claim 17

Dependent Claim 23 words

A composite foil as claimed in claim 1, further comprising an opaque layer on at lest one of said first and second layers.

Claim 18

Dependent Claim 17 words

A composite foil as claimed in claim 16, wherein said opaque layer is an aluminum vapor coating.

Claim 19

Dependent Claim 60 words

A package comprised of a plurality of layers, at least a first of said layers being an extruded thermoplastic material insoluble in pH neutral water, at least one other of said layers being in contact with said first layer and having a solubilizing agent capable of dissolving said extruded thermoplastic material, said layers being together readily decomposable in moist medium.

Claim 20

Dependent Claim 60 words

A package comprised of a plurality of layers, at least a first of said layers being an extruded thermoplastic material insoluble in pH neutral water, at least one other of said layers being in contact with said first layer and having a solubilizing agent capable of dissolving said extruded thermoplastic material, said layers being together readily decomposable in moist medium.

Claim 21

Dependent Claim 20 words

The package of claim 18 wherein said solubilizer comprises fine particles of a substance capable of solubilizing said first layer.

Claim 22

Dependent Claim 21 words

The composite foil of claim 1 wherein said solubilizer comprises fine particles of a substance capable of solubilizing said first layer.

Claim 23

Dependent Claim 21 words

The composite foil of claim 1 wherein said solubilizer is present in an amount for solubilizing said first and second layers.

Claim 24

Dependent Claim 132 words

A composite sheet material formed from at least two layers in which at least one normally water-insoluble sealing first layer is connected to at least one water soluble second layer, said second layer containing a solubilizer for said first layer, wherein said first layer comprises a non-porous layer formed by extrusion of thermoplastic material which is soluble in a non-neutral medium, and said second layer comprises a layer formed of a material which is (I) water soluble or (II) water-insoluble and soluble in a non-neutral medium, said solubilizer in said second layer being present in an amount sufficient for solubilizing said first layer and said second layer when the latter is also formed by extrusion of a water-insoluble material and wherein at least one of said first and second layers is self-supporting.

Claim 25

Dependent Claim 132 words

A composite sheet material formed from at least two layers in which at least one normally water-insoluble sealing first layer is connected to at least one water soluble second layer, said second layer containing a solubilizer for said first layer, wherein said first layer comprises a non-porous layer formed by extrusion of thermoplastic material which is soluble in a non-neutral medium, and said second layer comprises a layer formed of a material which is (I) water soluble or (II) water-insoluble and soluble in a non-neutral medium, said solubilizer in said second layer being present in an amount sufficient for solubilizing said first layer and said second layer when the latter is also formed by extrusion of a water-insoluble material and wherein at least one of said first and second layers is self-supporting.

Claim 26

Dependent Claim 14 words

The sheet material of claim 19 wherein said second layer is formed by extrusion.

Claim 27

Dependent Claim 12 words

The sheet material of claim 19 wherein said solubilizer comprises fine particles.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1990-06-08	1990-12-08	1991-06-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1994-06-08	1994-12-08	1995-06-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1998-06-08	1998-12-08	1999-06-09	$7700.00	Window Closed / Lapsed

Composite foil

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