Patent US5075142A successfully refreshed from Google Patents.
US5075142A
Expired / Lapsed
US
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Thermoformable composite sheet
Assignee: Xymid LLC
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Filing: 1990-02-20
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Granted: 1991-12-24
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Expires: 2010-02-20
Abstract
Abstract An improved thermoformable composite sheet comprises a layer of thermoplastic polymer and a lightweight stitchbonded nonwoven elastic fabric having a conformability at 180° C. in the range of 4 to 9. The sheet provides articles thermoformed therefrom with improved wall thickness uniformity.
Inventors
- 👤 Dimitri P. Zafiroglu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:52
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B32B25/00; B29; B29C; B29C51/00; B29C51/14; B29C51/145; B32B27/30; B32B27/308; B32B5/00; B32B5/02; B32B5/06; B32B7/00; B32B7/04; B32B7/12; D; D06; D06N; D06N3/00; D06N3/0002; D06N3/0015; D06N3/0025; D06N3/0031; D06N7/00; B29K; B29K2033/00; B29K2033/04; B29K2033/12; B29K2995/00; B29K2995/0037; B29K2995/0094; B29K2995/0097; B32B2333/00; B32B2333/04; B32B2333/12; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1362; Y10T428/1366; Y10T428/24; Y10T428/24033; Y10T428/249921; Y10T428/249953; Y10T428/24996; Y10T428/249976; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T442/00; Y10T442/40; Y10T442/469; Y10T442/50; Y10T442/59; Y10T442/60; Y10T442/601; Y10T442/647; Y10T442/659; Y10T442/666; Y10T442/667
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
In a thermoformable composite sheet having a thermoplastic polymer layer which is adhered to a relatively lightweight fabric layer, the improvement comprising the fabric layer being a stitchbonded nonwoven elastic fabric having a conformability at 180° C. in the range of 4 to 9 and amounting to no more than 20% of the total composite sheet weight.
Claim 2
Dependent Claim
57 words
In a thermoformable composite sheet having a thermoplastic polymer layer which is adhered to a relatively lightweight fabric layer, the improvement comprising the fabric layer being a stitchbonded nonwoven elastic fabric having a conformability at 180° C. in the range of 4 to 9 and amounting to no more than 20% of the total composite sheet weight.
Claim 3
Dependent Claim
31 words
A thermoformable composite sheet according to claim 1 wherein the conformability is in the range of 5 to 7 and the fabric weight is in the range of 2.5 to 10%.
Claim 4
Dependent Claim
24 words
A thermoformable composite sheet according to claim 1 wherein the polymer layer and the stitchbonded fabric are adhered to each other by an adhesive.
Claim 5
Dependent Claim
23 words
A thermoformable composite sheet according to claim 1 having the opposite face of the stitchbonded fabric adhered to a second thermoplastic polymer layer.
Claim 6
Dependent Claim
20 words
A thermoformable composite sheet according to claim 1, 2, 3 or 4 wherein the thermoplastic polymer is a polymethylmethacrylate polymer.
Claim 7
Dependent Claim
15 words
A shaped article thermoformed from the composite sheet of claim 1, 2, 3 or 4.
Claim 8
Dependent Claim
11 words
A shaped article thermoformed from the composite sheet of claim 5.
References Cited (Backward Citations)
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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) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |