US3955040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide film laminate with entrapped liquid
Assignee: WR Grace and Co
•
Filing: 1974-05-24
•
Granted: 1976-05-04
•
Expires: 1994-05-24
Abstract
Abstract In coextruded or extrusion coated, laminated, polymeric films which have been stretched by the inflated bubble technique, liquid can be entrapped between the collapsed bubble walls and can migrate to an interior layer of the laminate to treat same when the layer adjacent to the entrapped liquid is liquid permeable. For example, in a polyethylene/nylon/ethylene vinyl acetate/entrapped water/ethylene vinyl acetate/nylon/polyethylene laminated film the entrapped water will diffuse through the ethylene vinyl acetate layers to keep the nylon layers plasticized and impact resisitant.
Inventors
- 👤 Henry George Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:18
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/14; B29C48/147; B29C48/1472; B32B27/30; B32B27/306; B32B27/32; B32B27/34; B29C2791/00; B29C2791/004; B29C2791/007; B29C48/001; B29C48/0018; B29C48/0019; B29C48/03; B29C48/09; B29C48/10; B29C48/15; B29C48/154; B29C48/16; B29C48/18; B29C48/21; B32B2250/00; B32B2250/40; B32B2307/00; B32B2307/50; B32B2307/558; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31757; Y10T428/31855; Y10T428/3188; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A polyamide film laminate comprising: a. a laminated, stretched, flattened tube, said flattened tube including: 1. an inner layer of a liquid permeable, polymeric material selected from the group consisting of an ethylene vinyl acetate copolymer or an ethylene acrylic acid copolymer, 2. a polyamide layer adjacent said inner layer and disposed outwardly thereof; and, b. a layer of treating liquid entrapped by said inner layer of permeable material and forming a central layer in the laminate resulting from said flattened tube, said liquid being diffusible through said permeable layer to the surface of said polyamide layer and said layers being insoluble in said treating liquid.
Claim 2
Dependent Claim
106 words
A polyamide film laminate comprising: a. a laminated, stretched, flattened tube, said flattened tube including: 1. an inner layer of a liquid permeable, polymeric material selected from the group consisting of an ethylene vinyl acetate copolymer or an ethylene acrylic acid copolymer, 2. a polyamide layer adjacent said inner layer and disposed outwardly thereof; and, b. a layer of treating liquid entrapped by said inner layer of permeable material and forming a central layer in the laminate resulting from said flattened tube, said liquid being diffusible through said permeable layer to the surface of said polyamide layer and said layers being insoluble in said treating liquid.
Claim 3
Dependent Claim
10 words
The laminate of claim 1 wherein said liquid is water.
Claim 4
Dependent Claim
15 words
The laminate of claim 1 including a polyethylene layer disposed outwardly of said polyamide layer.
Claim 5
Dependent Claim
15 words
The laminate of claim 2 wherein said permeable layer is an ethylene vinyl acetate copolymer.
Claim 6
Dependent Claim
15 words
The laminate of claim 2 wherein said permeable layer is an ethylene acrylic acid copolymer.
References Cited (Backward Citations)
US3397263A
Cited
US3340091A
Cited
US3558330A
Cited
US3595735A
Cited
US3651200A
Cited
US3600267A
Cited
US3661695A
Cited
US3705659A
Cited
US3799167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |