Patent US5320892A successfully refreshed from Google Patents.
US5320892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tough layered papers with improved surface adhesion
Assignee: EIDP Inc
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Filing: 1993-02-22
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Granted: 1994-06-14
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Expires: 2013-02-22
Abstract
Abstract A laminate for honeycomb structures comprised of two outside layers having good surface adhesion and a tough core layer, said core constituting from 50 to 70% by weight of the laminate and containing from about 60 to 80% by weight of poly(m-phenylene isophthalamide) fibrids and each outside layer constituting from 15 to 25% by weight of the laminate and containing about 60 to 70% by weight of floc.
Inventors
- 👤 Gary L. Hendren
- 👤 Lee J. Hesler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:53
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; C; C08; C08J; C08J5/00; C08J5/04; C08J5/046; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/02; B32B2262/0261; B32B2262/0269; C08J2361/00; C08J2361/04; C08J2361/06; C08J2363/00; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A tough laminate with good surface adhesion comprising two outer layers and an inner layer, said inner layer constituting from 50 to 70 percent by weight of the laminate and containing from about 60 to 80% by weight of poly(m-phenylene isophthalamide) fibrids with the remainder floc and each outer layer constituting from 15 to 25 percent by weight of the laminate and containing from about 60 to 70% by weight of floc with the remainder being poly(m-phenylene isophthalamide) fibrids.
Claim 2
Dependent Claim
79 words
A tough laminate with good surface adhesion comprising two outer layers and an inner layer, said inner layer constituting from 50 to 70 percent by weight of the laminate and containing from about 60 to 80% by weight of poly(m-phenylene isophthalamide) fibrids with the remainder floc and each outer layer constituting from 15 to 25 percent by weight of the laminate and containing from about 60 to 70% by weight of floc with the remainder being poly(m-phenylene isophthalamide) fibrids.
Claim 3
Dependent Claim
12 words
A laminate according to claim 1 wherein the floc is poly(m-phenylene isophthalamide).
Claim 4
Dependent Claim
26 words
A laminate according to claim 1 having a density of from 0.6 to 0.9 and a basis weight of from 1.1 to 3.4 oz/yd 2 .
Claim 5
Dependent Claim
18 words
A honeycomb structure formed of the laminate of claim 1 and which has been impregnated with a resin.
References Cited (Backward Citations)
US2999788A
Cited
US3756908A
Cited
JPS61174497A
Cited
USH47H
Cited
US4710432A
Cited
US5021283A
Cited
US4957794A
Cited
US5126012A
Cited
JPH046708A
Cited
US5137768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-13 | 2005-12-13 | 2006-06-14 | $7700.00 | Window Closed / Lapsed |