US4855178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite chemical barrier fabric
Assignee: EIDP Inc
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Filing: 1988-09-19
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Granted: 1989-08-08
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Expires: 2008-09-19
Abstract
Abstract A multilayer chemical barrier fabric is made up of a base sheet of nonwoven polypropylene laminated to a multilayer film sheet having a film of ethylene vinyl alcohol sandwiched between films of nylon with a surface film of linear low-density polyethylene. Fabrics having this structure show resistance to breakthrough within 8 hours for 13 of 15 chemicals listed on the ASTM F1001 chemical test battery and shorter breakthrough times for the other two.
Inventors
- 👤 John D. Langley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:34
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; A; A62; A62B; A62B17/00; A62D; A62D5/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; B32B27/322; B32B27/34; B32B7/00; B32B7/04; B32B7/12; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2307/00; B32B2307/30; B32B2307/31; B32B2323/00; B32B2323/04; B32B2323/046; B32B2329/00; B32B2329/04; B32B2377/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249983; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/249993; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T442/00; Y10T442/60; Y10T442/674; Y10T442/678
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
57 words
A composite multilayer fabric consisting essentially of: a base sheet of relatively bulky, high-strength substrate and a multilayer film sheet laminated to one face of the base sheet; and said multilayer film sheet comprising a film of ethylene vinyl alcohol, a film layer of nylon laminated to each face thereof, and an outer film of heat-sealable polyethylene.
Claim 2
Dependent Claim
57 words
A composite multilayer fabric consisting essentially of: a base sheet of relatively bulky, high-strength substrate and a multilayer film sheet laminated to one face of the base sheet; and said multilayer film sheet comprising a film of ethylene vinyl alcohol, a film layer of nylon laminated to each face thereof, and an outer film of heat-sealable polyethylene.
Claim 3
Dependent Claim
13 words
The fabric of claim 1 wherein said base sheet is nonwoven polypropylene fabric.
Claim 4
Dependent Claim
15 words
The fabric of claim 2 wherein said outer film of polyethylene is linear low-density polyethylene.
Claim 5
Dependent Claim
20 words
The fabric of claim 3 including a layer of adhesive disposed between said base sheet and said multilayer film sheet.
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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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |