Patent US5581856A successfully refreshed from Google Patents.
US5581856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of uncoated technical fabrics with low air permeability
Assignee: Polyamide High Performance GmbH
•
Filing: 1995-05-31
•
Granted: 1996-12-10
•
Expires: 2015-05-31
Abstract
Abstract Uncoated technical fabric is produced in a dense weave with low air permeability. The fabric contains polyamide filament yarns with a hot air shrinkage of 6 to 15% (determined at 160 DEG C.) and has an at least substantially symmetrical fabric construction. The fabric is adjusted to the required air permeability by a treatment in an aqueous bath at 60 DEG to 140 DEG C.
Inventors
- 👤 Wolf Krummheuer
- 👤 Hans A. Graefe
- 👤 Volker Siejak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
D; D03; D03D; D03D1/00; D03D1/02; B; B60; B60R; B60R21/00; B60R21/02; B60R21/16; B60R21/23; B60R21/235; D03D15/00; D03D15/20; D03D15/283; D06; D06C; D06C7/00; B60R2021/23504; B60R2021/23509; D10; D10B; D10B2331/00; D10B2331/02; D10B2401/00; D10B2401/04; D10B2505/00; D10B2505/12; D10B2505/124; D10B2507/00; D10B2507/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
122 words
A process for the production of uncoated technical fabrics with low air permeability, said process comprising: providing polyamide filament yarns having a hot air shrinkage of 6-15% determined at 160° C. according to ASTM D4974; weaving said yarns to form a densely woven fabric having an at least substantially symmetrical fabric construction, and a density of at least about 71%, as determined by Walz's formula for determining density; decreasing the air permeability of said densely woven fabric by wet-treating said densely woven fabric in an aqueous bath in a temperature range of from 60° to 140° C.; and drying said wet-treated fabric, wherein said process is conducted without thermofixing said fabric, to obtain an uncoated technical fabric having a low air permeability.
Claim 2
Dependent Claim
122 words
A process for the production of uncoated technical fabrics with low air permeability, said process comprising: providing polyamide filament yarns having a hot air shrinkage of 6-15% determined at 160° C. according to ASTM D4974; weaving said yarns to form a densely woven fabric having an at least substantially symmetrical fabric construction, and a density of at least about 71%, as determined by Walz's formula for determining density; decreasing the air permeability of said densely woven fabric by wet-treating said densely woven fabric in an aqueous bath in a temperature range of from 60° to 140° C.; and drying said wet-treated fabric, wherein said process is conducted without thermofixing said fabric, to obtain an uncoated technical fabric having a low air permeability.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein said filament yarns are polyamide filament yarns.
Claim 4
Dependent Claim
16 words
A process according to claim 1, wherein said temperature range is from 90° to 140° C.
Claim 5
Dependent Claim
17 words
A process according to claim 1, wherein said temperature range is from 90° to about 100° C.
Claim 6
Dependent Claim
31 words
A process according to claim 1, wherein said decreasing produces an air permeability of said technical fabrics which is less than 10 l/dm 2 .min at 500 Pa test difference pressure.
Claim 7
Dependent Claim
20 words
A process according to claim 1, wherein said wet treating is carried out in a machine for open width washing.
Claim 8
Dependent Claim
15 words
A process according to claim 1, wherein said decreasing is carried out in a jig.
Claim 9
Dependent Claim
34 words
A process according to claim 1, wherein said decreasing produces an air permeability of said technical fabrics which ranges from about 40 to about 80 l/dm 2 .min at 500 Pa test difference pressure.
Claim 10
Dependent Claim
36 words
A process for producing an article requiring low air permeability comprising: providing an uncoated technical fabric according to the process of claim 1, and forming an article having low air permeability from the uncoated technical fabric.
Claim 11
Dependent Claim
11 words
The process of claim 9, wherein said article is an airbag.
Claim 12
Dependent Claim
11 words
The process of claim 9, wherein said article is a parachute.
Claim 13
Dependent Claim
11 words
The process of claim 9, wherein said article is sail cloth.
Claim 14
Dependent Claim
22 words
The process of claim 9, wherein said air permeability is less than 10 l/dm 2 .min at 500 Pa test difference pressure.
Claim 15
Dependent Claim
25 words
The process of claim 9, wherein said air permeability ranges from about 40 to about 80 l/dm 2 .min at 500 Pa test difference pressure.
Claim 16
Dependent Claim
22 words
The process of claim 1, wherein the drying of said fabric is carried out at a temperature not higher than 160° C.
Claim 17
Dependent Claim
9 words
A process according to claim 1, conducted without calendering.
References Cited (Backward Citations)
US1269340A
Cited
US2178743A
Cited
US2267117A
Cited
US2276605A
Cited
US2365931A
Cited
US2377434A
Cited
US2916348A
Cited
US3058702A
Cited
US3235932A
Cited
US3166824A
Cited
US3228745A
Cited
US3888504A
Cited
US3915632A
Cited
US3862822A
Cited
US3799574A
Cited
CA974745A
Cited
US3842583A
Cited
GB1444057A
Cited
US3978696A
Cited
EP0085972A2
Cited
US4559975A
Cited
US4445903A
Cited
US4517818A
Cited
JPS59204967A
Cited
JPS6025775A
Cited
US4582747A
Cited
US4590121A
Cited
JPS63105139A
Cited
US4945952A
Cited
JPS6444832A
Cited
US4921735A
Cited
US5093163A
Cited
JPH03167312A
Cited
US5025537A
Cited
JPH0611148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-10 | 2000-06-10 | 2000-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-10 | 2004-06-10 | 2004-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-10 | 2008-06-10 | 2008-12-10 | $7700.00 | Window Closed / Lapsed |