US5010663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low permeability fabric and method of making same
Assignee: Stern and Stern Industries Inc
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Filing: 1990-06-26
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Granted: 1991-04-30
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Expires: 2010-06-26
Abstract
Abstract A strong, lightweight, thin, flexible fabric of low permeability comprising an uncoated woven cloth characterized by a permeability of not more than one cubic foot of air per minute per square foot of cloth (0.5 cm3/sec/cm2) at a pressure drop of 0.5 inch of water (1.27 cm) across the cloth. The cloth is calendered on both sides to reduce its permeability.
Inventors
- 👤 Peter B. Thornton
- 👤 Stanley H. Cone
- 👤 George W. Booz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:23
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/02; B60R21/16; B60R21/23; B60R21/235; D; D03; D03D; D03D1/00; D03D1/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A method of making a strong, lightweight, thin, flexible fabric of low permeability comprising the steps of: (A) providing an uncoated, woven, strong, lightweight, thin, flexible cloth of high permeability; and (B) calendering the cloth on both sides without thermal degradation to reduce the permeability to not more than three cubic feet of air per minute per square foot of cloth (1.5 cm 3 /sec/cm 2 ) at a pressure drop of 0.5 inch of water (1.27 cm) across the cloth.
Claim 2
Independent Claim
81 words
A method of making a strong, lightweight, thin, flexible fabric of low permeability comprising the steps of: (A) providing an uncoated, woven, strong, lightweight, thin, flexible cloth of high permeability; and (B) calendering the cloth on both sides without thermal degradation to reduce the permeability to not more than three cubic feet of air per minute per square foot of cloth (1.5 cm 3 /sec/cm 2 ) at a pressure drop of 0.5 inch of water (1.27 cm) across the cloth.
Claim 3
Dependent Claim
77 words
The method of claim 1 wherein the cloth is calendered to reduce its permeability while providing a Mullen burst strength of at least 650 psi (4482 kilopascals), a tensile strength of at least 300 lbs. (1334 newtons), a trapezoid tear of at least 40 lbs. (178 newtons), an elongation at break of at least 25%, a weight of not more than 8.25 oz/square yard (280/gm/m 2 ) and a thickness of less than 0.016 inch (0.041 cm).
Claim 4
Dependent Claim
53 words
The method of claim 1 wherein the cloth is calendered on both sides to reduce the permeability to not more than one cubic foot of air per minute per square foot of cloth (0.5 cm 3 /sec/cm 2 ) at a pressure drop of 0.5 inch of water (1.27 cm) across the cloth.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein the cloth is calendered in a calender exerting a pressure of 65-75 psi (448-517 kilopascals) at a temperature of about 350°-370° F. (177°-188° C.).
Claim 6
Dependent Claim
30 words
The method of claim 4 wherein the cloth is calendered in a calender exerting a pressure of 70 psi (483 kilopascals) at a temperature of about 360° F. (182° C.).
Claim 7
Dependent Claim
39 words
The method of claim 1 wherein the cloth is calendered in a calender exerting 65-80 tons/70 inch base (59.0-72.6×10 3 kilograms/178 cm) at a nominal nip of 0.5 inch (1.27 cm) at a temperature of 350°-370° F. (177°-188° C.).
Claim 8
Dependent Claim
29 words
The method of claim 6 wherein the cloth is calendered in a calender exerting about 70 tons (63.5×10 3 kilograms) at a temperature of about 360° F. (182° C.).
Claim 9
Dependent Claim
9 words
The fabric produced by the method of claim 1.
Claim 10
Independent Claim
164 words
A method of making a strong, lightweight, thin, flexible fabric of low permeability comprising the steps of: (A) providing an uncoated, woven, strong, lightweight, thin, flexible cloth of high permeability; and (B) calendering the cloth on both sides without thermal degradation in a calendar exerting a pressure of 65-75 psi (448-517 kilopascals) at a temperature of 350°-370° F. (177°-188° C.) to reduce the permeability to not more than three cubic feet of air per minute per square foot of cloth (1.5 cm 3 /sec/cm 2 ) at a pressure drop of 0.5 inch of water (1.27 cm) across the cloth while retaining a Mullen burst strength of at least 650 psi (4482 kilopascals), a tensile strength of at least 300 lbs. (1334 newtons), a trapezoid tear of at least 40 lbs. (178 newtons), an elongation at break of at least 25%, a weight of not more than 8.25 oz/square yard (280 gm/m 2 ) and a thickness of less than 0.016 inch (0.041 cm).
Claim 11
Independent Claim
164 words
A method of making a strong, lightweight, thin, flexible fabric of low permeability comprising the steps of: (A) providing an uncoated, woven, strong, lightweight, thin, flexible cloth of high permeability; and (B) calendering the cloth on both sides without thermal degradation in a calendar exerting a pressure of 65-75 psi (448-517 kilopascals) at a temperature of 350°-370° F. (177°-188° C.) to reduce the permeability to not more than three cubic feet of air per minute per square foot of cloth (1.5 cm 3 /sec/cm 2 ) at a pressure drop of 0.5 inch of water (1.27 cm) across the cloth while retaining a Mullen burst strength of at least 650 psi (4482 kilopascals), a tensile strength of at least 300 lbs. (1334 newtons), a trapezoid tear of at least 40 lbs. (178 newtons), an elongation at break of at least 25%, a weight of not more than 8.25 oz/square yard (280 gm/m 2 ) and a thickness of less than 0.016 inch (0.041 cm).
Claim 12
Dependent Claim
9 words
The fabric produced by the method of claim 9.
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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) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |