US3836425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin, flexible barrier material
Assignee: Ludlow Corp
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Filing: 1971-01-12
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Granted: 1974-09-17
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Expires: 1991-01-12
Abstract
Abstract A fabric- and fiber-free, heat-sealable structure useful as a barrier material limiting passage through itself of solids, liquids, semisolids, gases or forms of energy such as ultraviolet light, said structure comprising a first ply of a relatively tough, biaxially-oriented film of an organic polymer adhered to a second ply of a metallic foil and a third ply of a tough polymer such as polyethylene. Such a laminated structure having a total thickness of less than ten mils (0.010) meets the requirements of the widely-known MIL-b-131 specification and is relatively nondirectional in its strength characteristics.
Inventors
- 👤 P Whiting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/082; B32B15/085; B32B15/088; B32B27/00; B32B27/30; B32B27/304; B32B27/32; B32B27/34; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7246; B32B2323/00; B32B2323/04; B32B2323/10; B32B2327/00; B32B2327/06; B32B2367/00; B32B2379/00; B32B2379/08; B32B2439/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31551; Y10T428/31562; Y10T428/31565; Y10T428/31573; Y10T428/31587; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
36 words
A barrier material of claim 1 wherein the biaxially-oriented polymeric film is a sheet of less than about 0.0008 inches in thickness and the maximum composite thickness of the sheet is not above about 0.010 inch.
Claim 2
Dependent Claim
12 words
A barrier material of claim 2 wherein the biaxially-oriented material is nylon.
Claim 3
Dependent Claim
21 words
A barrier material as defined in claim 3 comprising a polyurethane primer material between said biaxially-oriented polymeric film and said adhesive.
Claim 4
Dependent Claim
13 words
A barrier material as defined in claim 3 wherein said adhesive is polyethylene.
Claim 5
Dependent Claim
18 words
A barrier material of claim 2 wherein the biaxially-oriented material is selected from polypropylene and poly(ethylene terephthalate) film.
Claim 6
Dependent Claim
21 words
A barrier material as defined in claim 2 comprising a polyurethane primer material between said biaxially-oriented polymeric film and said adhesive.
Claim 7
Dependent Claim
13 words
A barrier material as defined in claim 2 wherein said adhesive is polyethylene.
Claim 8
Dependent Claim
46 words
A barrier material as defined in claim 1 which is characterized by a water vapor transmission rate of less than about 0.012 grams per 100 square inches per 24 hours of test time after it has been flex-conditioned according to Federal Test Method Standard No. 101B.
Claim 9
Dependent Claim
21 words
A barrier material as defined in claim 1 comprising a polyurethane primer material between said biaxially-oriented polymeric film and said adhesive.
Claim 10
Dependent Claim
13 words
A barrier material as defined in claim 10 wherein said adhesive is polyethylene.
Claim 11
Dependent Claim
13 words
A barrier material as defined in claim 1 wherein said adhesive is polyethylene.
Claim 12
Dependent Claim
64 words
In a barrier material of improved flexibility, but of the type meeting the requirements of Military Specification MIL-B-131E, said material consisting of plys of polyethylene, aluminum, and an impact-resistant layer, the improvement wherein said impact-resistant layer is a biaxially-oriented polymeric film having a thickness of less than 0.0008 inch and comprising less than about 20 percent of the total thickness of said barrier material.
Claim 13
Dependent Claim
14 words
A barrier material as defined in claim 13 wherein said biaxially-oriented material is nylon.
Claim 14
Dependent Claim
19 words
A barrier material as defined in claim 13 wherein said biaxially-oriented material is selected from poly(ethylene terephalate) and polypropylene.
Claim 15
Dependent Claim
27 words
A barrier material as defined in claim 13 having a water-vapor transmission rate of less than about 0.012 grams of per 100 square inches per 24 hours.
Claim 16
Dependent Claim
21 words
A barrier material as defined in claim 13 comprising a polyurethane primer material between said biaxially-oriented polymeric film and said adhesive.
Claim 17
Dependent Claim
13 words
A barrier material as defined in claim 13 wherein said adhesive is polyethylene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |